How can I input an Icon in Navbar of IntelliJ
已回答
I have just added some actions in my Navbar. Some of the actions are appearing with the Icon of question mark. How can I add some different Icons here?
Screenshot: 
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A custom icon can be added exactly where you've added the action itself, that is, in IDE Preferences | Appearance and Behavior | Menus and toolbars | Navigation bar toolbar (or Main Toolbar if the actions have been added there). Please refer to this Help article for the detailed instruction.