- Open
Settingsby hittingCtrl+Alt+S - Click:
Keymap - Search for:
Close - Under
Main menu > Window > Editor Tabs, findClose. - Right-click and click
Remove Ctrl+F4. - Right click and click
Add Keyboard Shortcut - Add your new custom Keyboard Shortcut.
IntelliJ will tell you if the shortcut clashes with another shortcut performing a different action.
Alternatively, open/edit your Linux Window Manager Settings and remove the Ctrl+F4 mapping to allow other programs like IntelliJ to make use of it.