From my experience using Brave on desktop, it seems Blink-based browsers lack many options for managing history and cookies, so while I don't expect there to be an easy toggle like Firefox has with "Remember browsing and download history" or the ability to delete just a single cookie, I know Blink-based browsers generally have some roundabout ways of managing this.
On Brave, you have to compromise with clearing browser history on exit, which is fine. This option does not appear to be available in Vanadium.
How do you turn off history or automatically clear history?
I've seen the suggestion to create an Incognito shortcut on the home screen, but this doesn't work for PWAs. I would say 80% of my Vanadium usage is PWAs, so this is not a suitable workaround for me.