Since last version V1.25.68 It is not possible to disable the extensions Tab in the toolbar adding " --disable-features=ExtensionsToolbarMenu " on Brave> Properties>Shortcut>Target.
I for one I would much appreciate been given the choice to hide it.
But hey in my country of origin there is a say " One swallow does not means it is Springtime.
So until a lot more swallows join in I am not holding my breath that we are given the choice.
Hopefully some nice fellow come up with a new solution.