By default windows always slightly smaller than combined column widths...

[trekytech7]

Describe the bug
More of a feature improvement of sorts... Every place I login and new tabs opened the combined column widths are slightly larger than the window size, once a subfolder is opened. This can get annoying after awhile when slight side movements of the trackpad cause sideways movements of contents in the window, when scrolling up or down (ie. when visually scanning the contents). If the combined tabs width is slightly smaller, then content 'side movements' will not happen. ie. when logged into a site for a long time I'm often shrinking the rightmost tab a bit to improve the behaviour.

To Reproduce
Steps to reproduce the behavior:

1. Login to a site.
2. Click the arrow of a subfolder to see its contents.
3. Now with the trackpad move content slightly right or left (ie. 2 finger on trackpad)...
4. The windows contents will move left or right.
5. If the rightmost tab is shrunk slightly then you may scroll up and down (even with unintensional slight sideways movements) without causing sideways movements of the contents.

Expected behavior
I would prefer the contents to move up and down without side movements by default. A rightmost tab placed slightly before the edge of the window could fix this behaviour... So then it wouldn't behave this way for every single window opened.

Screenshots
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Desktop (please complete the following information):

• OS: I'm on macOS
• n/a

Log Files
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Additional context
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