Left menu "Project" and space between code and line number
Answered

How can I fix this? There's a big space between line numbers and code.
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View | Exit Distraction Free Mode.
Thank you Serge Baranov!
It would be lovely to see some notification on how to leave this "Distraction Free" mode in the IDE. Once I accidentally entered it, I truly became distracted because I had no idea what happened and how to undo it.
view->Active Editor->show gutter icon(uncheck)