Welcome to the community. I can’t help as I am not tech savvy at all. Can you please provide your OS version, graphics card, and what type display you are using? Also, please confirm that your drivers are all up-to-date. I think that additional information will help either a community member or Brave support troubleshoot.
In the meantime, posting a topic with troubleshooting steps that I think can be applied generically. The OP was on win10, had an AMD graphics card, and a 4k/60 Hz screen.
Please post an update with additional information. Take care. 