This is a simple workaround for not currently being able to show the filename in the status bar.
The plugin Status Bar File Name & Recent Files no longer works on my machine, so I created a new implementation which the newer IDE's can run.
Shows the file name of the currently open file in the status bar.
This is a workaround from this not currently being natively supported in the IDE.
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Using the IDE built-in plugin system:
Settings/Preferences > Plugins > Marketplace > Search for "Idea Statusbar Filename" > Install
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Manually:
Download the latest release and install it manually using Settings/Preferences > Plugins > ⚙️ > Install plugin from disk...