Turn off the red underwave of file/project/folder UI elements when errors are detected in code
Answered
Is there a way to turn this functionality off without turning off the error detection?
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There is no such functionality. Underlining in the project window disappears once inspections for the error is disabled under "Preferences | Editor | Inspections".
There is a request on our bug tracker to improve project window's file highlightings:
https://youtrack.jetbrains.com/issue/IDEA-96288
You can also create your custom theme and make the highlighting invisible inside.