diff --git a/web/src/components/ui/page-title.tsx b/web/src/components/ui/page-title.tsx
index d4507c5..8f6966a 100644
--- a/web/src/components/ui/page-title.tsx
+++ b/web/src/components/ui/page-title.tsx
@@ -6,7 +6,7 @@ export function PageTitle({ className, ...props }: ComponentProps<"h1">) {
   return (
     <h1
       data-slot="page-title"
-      className={cn("text-2xl font-semibold tracking-tight", className)}
+      className={cn("text-2xl font-semibold tracking-tight text-balance", className)}
       {...props}
     />
   )
diff --git a/web/src/fields/field-form.tsx b/web/src/fields/field-form.tsx
index 60afd05..c98ef46 100644
--- a/web/src/fields/field-form.tsx
+++ b/web/src/fields/field-form.tsx
@@ -110,6 +110,8 @@ export function FieldForm({
         )}
       </div>
 
+      {isEdit && <p className="text-xs text-muted-foreground">{t("fields.lockedNote")}</p>}
+
       <div className="space-y-1">
         <Label htmlFor="field-key">{t("fields.key")}</Label>
         <Input
diff --git a/web/src/fields/field-list.tsx b/web/src/fields/field-list.tsx
index c97e239..c411667 100644
--- a/web/src/fields/field-list.tsx
+++ b/web/src/fields/field-list.tsx
@@ -90,18 +90,23 @@ export function FieldList({
                   >
                     <button
                       type="button"
-                      className={cn("flex flex-1 items-center gap-2 rounded-sm text-left", focusRing)}
+                      className={cn(
+                        "flex min-w-0 flex-1 items-center gap-2 rounded-sm text-left",
+                        focusRing,
+                      )}
                       aria-pressed={def.key === selectedKey}
                       onClick={() => onSelect(def)}
                     >
-                      <span className="font-medium">{labelText(def.labels, lang)}</span>
+                      <span className="min-w-0 truncate font-medium">
+                        {labelText(def.labels, lang)}
+                      </span>
                       <span className="text-xs text-muted-foreground">{def.key}</span>
-                      <Badge variant="secondary">
+                      <Badge variant="secondary" className="shrink-0">
                         {t(`fields.types.${def.data_type}`)}
                       </Badge>
                       {def.required && (
                         <span
-                          className="text-xs text-destructive"
+                          className="shrink-0 text-xs text-destructive"
                           title={t("fields.required")}
                           aria-label={t("fields.required")}
                         >
diff --git a/web/src/i18n/en.json b/web/src/i18n/en.json
index c50bbbb..abc08b0 100644
--- a/web/src/i18n/en.json
+++ b/web/src/i18n/en.json
@@ -5,7 +5,7 @@
   "objects": { "title": "Objects", "empty": "No objects yet", "loadError": "Could not load objects", "notFound": "Object not found", "prev": "Previous", "next": "Next", "of": "of", "new": "New object", "filter": "Filter objects…", "pageSize": "Per page", "columns": { "number": "Object №", "name": "Name", "visibility": "Visibility", "location": "Location", "count": "#", "updated": "Updated" }, "unknownRef": "(unknown)", "detailTitle": "Object detail", "tableLabel": "Objects" },
   "fieldsLabels": { "objectNumber": "Object number", "objectName": "Name", "count": "Number of objects", "briefDescription": "Brief description", "currentLocation": "Current location", "currentOwner": "Current owner", "recorder": "Recorder", "recordingDate": "Recording date", "visibility": "Visibility" },
   "visibility": { "draft": "Draft", "internal": "Internal", "public": "Public" },
-  "form": { "selectPlaceholder": "— select —", "create": "Create object", "save": "Save", "cancel": "Cancel", "visibility": "Visibility", "draft": "Draft", "internal": "Internal", "required": "This field is required", "rejected": "The server rejected the changes — check required and referenced fields", "fieldRejected": "The field \"{{field}}\" was rejected — check its value", "createdButFieldRejected": "Object created, but a field was rejected — fix it below.", "flexibleHeading": "Catalogue fields", "saving": "Saving…", "createAnother": "Save & create another", "minCount": "Must be at least 1", "fieldError": { "type_mismatch": "Wrong type for this field", "unresolved": "Referenced value not found", "unknown": "Unknown field" }, "unsaved": { "title": "Discard unsaved changes?", "body": "You have unsaved changes that will be lost.", "stay": "Keep editing", "leave": "Discard" } },
+  "form": { "selectPlaceholder": "Select…", "create": "Create object", "save": "Save", "cancel": "Cancel", "visibility": "Visibility", "draft": "Draft", "internal": "Internal", "required": "This field is required", "rejected": "The server rejected the changes — check required and referenced fields", "fieldRejected": "The field \"{{field}}\" was rejected — check its value", "createdButFieldRejected": "Object created, but a field was rejected — fix it below.", "flexibleHeading": "Catalogue fields", "saving": "Saving…", "createAnother": "Save & create another", "minCount": "Must be at least 1", "fieldError": { "type_mismatch": "Wrong type for this field", "unresolved": "Referenced value not found", "unknown": "Unknown field" }, "unsaved": { "title": "Discard unsaved changes?", "body": "You have unsaved changes that will be lost.", "stay": "Keep editing", "leave": "Discard" } },
   "actions": { "deleting": "Deleting…", "edit": "Edit", "delete": "Delete", "rename": "Rename", "save": "Save", "closeDetail": "Close detail", "confirmDelete": "Delete this object? This cannot be undone.", "confirmDeleteTerm": "Delete this term? This cannot be undone.", "confirmDeleteAuthority": "Delete this authority? This cannot be undone.", "confirmDeleteField": "Delete this field definition? This cannot be undone.", "confirmDeleteVocabulary": "Delete this vocabulary? This cannot be undone.", "inUse": "Can't delete — used by {{count}} object(s). Clear those fields first." },
   "labels": { "label": "Label", "externalUri": "External URI (optional)", "otherLanguages": "This entry also has labels in other languages, which are kept.", "uriPlaceholder": "https://…" },
   "theme": { "light": "Light", "dark": "Dark", "system": "System" },
@@ -41,6 +41,7 @@
     "authorityKind": "Authority kind",
     "anyKind": "Any",
     "group": "Group",
+    "lockedNote": "Key and type can't be changed after creation.",
     "required": "Required",
     "create": "Create field",
     "empty": "No field definitions yet",
diff --git a/web/src/i18n/sv.json b/web/src/i18n/sv.json
index f5f71ab..825fdea 100644
--- a/web/src/i18n/sv.json
+++ b/web/src/i18n/sv.json
@@ -5,7 +5,7 @@
   "objects": { "title": "Föremål", "empty": "Inga föremål ännu", "loadError": "Kunde inte ladda föremål", "notFound": "Föremålet hittades inte", "prev": "Föregående", "next": "Nästa", "of": "av", "new": "Nytt föremål", "filter": "Filtrera föremål…", "pageSize": "Per sida", "columns": { "number": "Föremålsnr", "name": "Namn", "visibility": "Synlighet", "location": "Plats", "count": "Antal", "updated": "Uppdaterad" }, "unknownRef": "(okänd)", "detailTitle": "Objektdetalj", "tableLabel": "Objekt" },
   "fieldsLabels": { "objectNumber": "Föremålsnummer", "objectName": "Namn", "count": "Antal föremål", "briefDescription": "Kort beskrivning", "currentLocation": "Nuvarande plats", "currentOwner": "Nuvarande ägare", "recorder": "Registrerad av", "recordingDate": "Registreringsdatum", "visibility": "Synlighet" },
   "visibility": { "draft": "Utkast", "internal": "Intern", "public": "Publik" },
-  "form": { "selectPlaceholder": "— välj —", "create": "Skapa föremål", "save": "Spara", "cancel": "Avbryt", "visibility": "Synlighet", "draft": "Utkast", "internal": "Intern", "required": "Fältet är obligatoriskt", "rejected": "Servern avvisade ändringarna — kontrollera obligatoriska och refererade fält", "fieldRejected": "Fältet \"{{field}}\" avvisades — kontrollera värdet", "createdButFieldRejected": "Föremålet skapades, men ett fält avvisades — åtgärda nedan.", "flexibleHeading": "Katalogfält", "saving": "Sparar…", "createAnother": "Spara & skapa ny", "minCount": "Måste vara minst 1", "fieldError": { "type_mismatch": "Fel typ för detta fält", "unresolved": "Refererat värde hittades inte", "unknown": "Okänt fält" }, "unsaved": { "title": "Kasta osparade ändringar?", "body": "Du har osparade ändringar som går förlorade.", "stay": "Fortsätt redigera", "leave": "Kasta" } },
+  "form": { "selectPlaceholder": "Välj…", "create": "Skapa föremål", "save": "Spara", "cancel": "Avbryt", "visibility": "Synlighet", "draft": "Utkast", "internal": "Intern", "required": "Fältet är obligatoriskt", "rejected": "Servern avvisade ändringarna — kontrollera obligatoriska och refererade fält", "fieldRejected": "Fältet \"{{field}}\" avvisades — kontrollera värdet", "createdButFieldRejected": "Föremålet skapades, men ett fält avvisades — åtgärda nedan.", "flexibleHeading": "Katalogfält", "saving": "Sparar…", "createAnother": "Spara & skapa ny", "minCount": "Måste vara minst 1", "fieldError": { "type_mismatch": "Fel typ för detta fält", "unresolved": "Refererat värde hittades inte", "unknown": "Okänt fält" }, "unsaved": { "title": "Kasta osparade ändringar?", "body": "Du har osparade ändringar som går förlorade.", "stay": "Fortsätt redigera", "leave": "Kasta" } },
   "actions": { "deleting": "Tar bort…", "edit": "Redigera", "delete": "Ta bort", "rename": "Byt namn", "save": "Spara", "closeDetail": "Stäng detalj", "confirmDelete": "Ta bort detta föremål? Detta kan inte ångras.", "confirmDeleteTerm": "Ta bort denna term? Detta kan inte ångras.", "confirmDeleteAuthority": "Ta bort denna auktoritet? Detta kan inte ångras.", "confirmDeleteField": "Ta bort denna fältdefinition? Detta kan inte ångras.", "confirmDeleteVocabulary": "Ta bort denna vokabulär? Detta kan inte ångras.", "inUse": "Kan inte ta bort — används av {{count}} föremål. Rensa de fälten först." },
   "labels": { "label": "Etikett", "externalUri": "Extern URI (valfritt)", "otherLanguages": "Denna post har även etiketter på andra språk, som behålls.", "uriPlaceholder": "https://…" },
   "theme": { "light": "Ljust", "dark": "Mörkt", "system": "System" },
@@ -41,6 +41,7 @@
     "authorityKind": "Auktoritetstyp",
     "anyKind": "Alla",
     "group": "Grupp",
+    "lockedNote": "Nyckel och typ kan inte ändras efter att fältet skapats.",
     "required": "Obligatoriskt",
     "create": "Skapa fält",
     "empty": "Inga fältdefinitioner ännu",
diff --git a/web/src/objects/field-input.test.tsx b/web/src/objects/field-input.test.tsx
index 458e85a..164cbd2 100644
--- a/web/src/objects/field-input.test.tsx
+++ b/web/src/objects/field-input.test.tsx
@@ -54,7 +54,7 @@ test("term field filters and selects from the vocabulary combobox", async () =>
 
   renderApp(<FormHarness defKey="material" onSubmit={(v) => submitted.push(v)} />);
 
-  const input = await screen.findByPlaceholderText("— select —");
+  const input = await screen.findByPlaceholderText("Select…");
 
   await user.click(input);
   await user.type(input, "bro");
@@ -73,7 +73,7 @@ test("authority field filters and selects from the authority combobox", async ()
 
   renderApp(<FormHarness defKey="maker" onSubmit={(v) => submitted.push(v)} />);
 
-  const input = await screen.findByPlaceholderText("— select —");
+  const input = await screen.findByPlaceholderText("Select…");
 
   await user.click(input);
   await user.type(input, "ada");
diff --git a/web/src/shell/sidebar.tsx b/web/src/shell/sidebar.tsx
index 31fd1bf..3e26175 100644
--- a/web/src/shell/sidebar.tsx
+++ b/web/src/shell/sidebar.tsx
@@ -80,15 +80,16 @@ export function Sidebar() {
         <button
           type="button"
           onClick={toggle}
-          disabled={narrow}
           aria-expanded={!collapsed}
           aria-label={t(collapsed ? "nav.expandSidebar" : "nav.collapseSidebar")}
           title={t(collapsed ? "nav.expandSidebar" : "nav.collapseSidebar")}
           className={cn(
-            "flex items-center justify-center rounded-md p-1 outline-none",
+            // On narrow viewports the rail is forced collapsed, so the toggle
+            // is hidden rather than shown disabled (a grayed button reads as
+            // broken, not unavailable).
+            "hidden items-center justify-center rounded-md p-1 outline-none md:flex",
             "hover:bg-accent",
             focusRing,
-            "disabled:pointer-events-none disabled:opacity-50",
           )}
         >
           {collapsed ? (