Tell me how to change the vertical line (for example, make it a little brighter) for readability.
Answered
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Such feature is called "Show indent guides" and can be found in Preferences | Editor | General | Appearance.
Color keys responsible for such lines are:
and
where can I find these keys? I didn't find( and couldn't make them brighter.
INDENT_GUIDE_COLORand
SELECTED_INDENT_GUIDE_COLOR