<ul><li>The question mark Dock icon is an indicator that the linked app, file, or folder, is no longer where it was expected to be.</li><li>The question mark shows up if an app, file, or folder has been moved, uninstalled, or deleted.</li><li>To remove the question mark icon from the Mac Dock, click and hold on it, then drag it out of the Dock.</li><li>To fix the question mark icon, find the original item it was linked to, and drag it back into the Mac Dock.</li></ul>

Why is There a Question Mark Icon in the Dock on Mac?

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