Presently users are unable to resize the vertical tab sidebar. It’s not a massive inconvenience but I’d prefer the bar to be thinner for my use. Somewhere in between the auto-hide bar size and the full size.
I could also see a use case for expanding it, allowing the entire page title to be read in the vertical tab bar.
It was already added in Nightly a week ago. https://github.com/brave/brave-core/pull/18567
before making a Feature Request, maybe either use Nightly and make sure it wasn’t already added to it, or check Brave’s (core) github where you can see if they are working on it or already added it to Nightly.
Stable is months behind in updates compared with Nightly in many cases (for obvious reasons), so if you make a Feature Request based on Stable build, then you won’t be aware of Brave’s current development of features.