"Leave sync chain" does nothing on MacOS Catalina

Running MacOS Catalina and Brave v1.26.74. I have no other devices being sync’d to this MacBook, but when I go to the Sync function, which lists only my MacBook, and click at the bottom of the page on “Leave sync chain”, I am returned to the main settings page. Nothing else happens, and I remain unable to leave the sync chain. I really want to sync this MacBook to my main sync chain that has three other devices on it, but how do I do this?

I have the exactly same problem but I use Windows 10 and also the brave rewards are not working but one thing is having issues with the browser the second is to get support to resolve, sometimes your message will be closed before someone replies to you