diff --git a/src/renderer/components/item-list/helpers/autosize-unpinned-columns.ts b/src/renderer/components/item-list/helpers/autosize-unpinned-columns.ts
new file mode 100644
index 000000000..114326d54
--- /dev/null
+++ b/src/renderer/components/item-list/helpers/autosize-unpinned-columns.ts
@@ -0,0 +1,23 @@
+import { ItemTableListColumnConfig } from '/@/renderer/components/item-list/types';
+
+// Automatically set autoSize for all unpinned columns when auto-fit is off
+// This is a view-only helper and does not persist to settings
+export const autoSizeUnpinnedColumns = (
+    columns: ItemTableListColumnConfig[],
+    autoFitColumns: boolean,
+): ItemTableListColumnConfig[] => {
+    if (autoFitColumns || columns.length === 0) {
+        return columns;
+    }
+
+    const unpinnedEnabled = columns.filter((c) => c.pinned === null && c.isEnabled !== false);
+    if (unpinnedEnabled.length === 0) {
+        return columns;
+    }
+    if (unpinnedEnabled.some((c) => c.autoSize === true)) {
+        return columns;
+    }
+
+    const idSet = new Set(unpinnedEnabled.map((c) => c.id));
+    return columns.map((c) => (idSet.has(c.id) ? { ...c, autoSize: true } : c));
+};
diff --git a/src/renderer/components/item-list/item-table-list/item-table-list.tsx b/src/renderer/components/item-list/item-table-list/item-table-list.tsx
index b88cf3356..85c10097a 100644
--- a/src/renderer/components/item-list/item-table-list/item-table-list.tsx
+++ b/src/renderer/components/item-list/item-table-list/item-table-list.tsx
@@ -21,6 +21,7 @@ import { type CellComponentProps, Grid } from 'react-window-v2';
 
 import styles from './item-table-list.module.css';
 
+import { autoSizeUnpinnedColumns } from '/@/renderer/components/item-list/helpers/autosize-unpinned-columns';
 import { createExtractRowId } from '/@/renderer/components/item-list/helpers/extract-row-id';
 import { useDefaultItemListControls } from '/@/renderer/components/item-list/helpers/item-list-controls';
 import {
@@ -1278,6 +1279,11 @@ const BaseItemTableList = ({
     const [centerContainerWidth, setCenterContainerWidth] = useState(0);
     const [totalContainerWidth, setTotalContainerWidth] = useState(0);
 
+    const columnsForLayout = useMemo(
+        () => autoSizeUnpinnedColumns(columns, autoFitColumns),
+        [autoFitColumns, columns],
+    );
+
     const {
         calculatedColumnWidths,
         parsedColumns,
@@ -1287,7 +1293,7 @@ const BaseItemTableList = ({
     } = useTableColumnModel({
         autoFitColumns,
         centerContainerWidth,
-        columns,
+        columns: columnsForLayout,
         totalContainerWidth,
     });