brookie229 The blue button that appears is labeled as "Relaunch". Have you tried to actually restart the Vanadium browser? As in exiting or force stopping, then opening it again from the app drawer?
Maybe try setting chrome://flags/#android-bottom-toolbar to default, then instead of tapping the "Relaunch" blue button that appears, quit Vanadium properly or force stop it. Repeat the same process to re-enable the flag while making sure not to tap that relaunch blue button and restart/quit/force stop the Vanadium app.
brookie229 After making the change a blue reset button appears to restart and I did that.