I can't find the Stashes (nor REMOTES, BRANCHES, FILE HISTORY) menu in the Source Control (the one you open up with Ctrl-Shift-U) tool bar.
This is how my Visual Studio Code looks like:
And this is a picture I found on the web with the menu options I'd like to restore:
I couldn't find an option to restore these menu options.
it seems like somehow GitLens, instead of replacing the Source Control panel, add his own: