Gmail as of Aug 13 will not open in Standard mode, it forces HTML mode only on Brave Browser, please help!

[Akasam]

I had the same issue for a few days and today I had the idea to change the User Agent, just in case Gmail doesn’t accept Brave anymore… Guess what ? It worked…
I use now a Chrome 90 / Win10 UA thanks to User-Agent Switcher and Manager extension.