Looks like someone had already opened a GH issue on this:
opened 10:32AM - 01 Oct 23 UTC
OS/Desktop
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## Description
Sidebar takes ~1/3 of browser width, which it shouldn't.
## Steps to Reproduce
1. Set sidebar apperance to left or right side
2. Set sidebar trigger to 'Mouse over'
3. Move mouse cursor to very left or right side
## Actual result:
<img width="960" alt="Unbenannt1" src="https://github.com/brave/brave-browser/assets/146629557/96c7710c-fbaa-4be2-8316-d7ef0108d57c">
## Expected result:
<img width="960" alt="Unbenann2" src="https://github.com/brave/brave-browser/assets/146629557/59e71d78-a977-4cd9-bee3-2b87626d01f2">
## Reproduces how often:
Everytime.
## Brave version (brave://version info)
Last working Brave version
Nightly v1.58.14 (Chromium 115.0.5790.75)
Bug appeared with version
Nightly v1.58.16 (Chromium 115.0.5790.75)
Bug still present in (actual) Brave version
Nightly v1.60.69 (Chromium 118.0.5993.21)
## Miscellaneous Information:
Seems to affect Windows only
(Tested with Win10.
Sidebar behaves correctly in Ubuntu and Steam Deck.
Didn't test with Apple and Android devices)
Edit:
Got confused with dev/beta/nightly releases.
This time i compared only nightly versions,
I’ve pinged some team members internally about this to take a look. I feel confident that it is an actual bug as any user encountering it seems to be able to reproduce it consistently. Hope to have more troubleshooting steps and/or a fix soon. Will reply back here as soon as I know more.