I do not see a Nav Bar on your screenshot. Only Menu Bar, header of Project View tool window and Editor tabs...
But based on yellowish highlighting ... it must be the Menu Bar ... and you want to remove underline under some letters (mnemonics; that show what Alt + key to press to quickly reach that menu; standard thing).
If so -- "File | Settings | Appearance & Behavior | Appearance | Window Options | Disable mnemonics in menu"
Hi there,
I do not see a Nav Bar on your screenshot. Only Menu Bar, header of Project View tool window and Editor tabs...
But based on yellowish highlighting ... it must be the Menu Bar ... and you want to remove underline under some letters (mnemonics; that show what Alt + key to press to quickly reach that menu; standard thing).
If so -- "File | Settings | Appearance & Behavior | Appearance | Window Options | Disable mnemonics in menu"