Provide independent theme options to adjust left margin of files and folders

[Monokai]

Problem description

Currently valuable whitespace is taken up by the folder list, which starts with a single folder that you can expand.

I can control this left spacing in my theme via the indent_offset attribute of the sidebar_tree class, but this also moves the file list on top.

Unfortunately this file list also has close buttons on hover, which appear on the left of the files. When I decrease the indenting, these buttons quickly fall off screen.

Preferred solution

What I'd like is to be able to control the indenting of the folder list separately from the file list.

Alternatives

I guess you could also disable the expanding of the top folder and remove its icon, but I guess some people like to collapse the folder.

Additional Information

No response