Just downloaded Brave, and it appears that this browser is not playing nice with navigation by mouse in the Zazzle Design Tool (moving, resizing, etc. – it either doesn’t work, or happens sporadically). Tried with a number of designs.
We officially support Safari, Chrome, Firefox, and Edge. Other browsers, even if they’re a fork or Chromium-based, are not used for testing by our engineering team, so there may be issues there. We currently do not have the resources to review our site’s features on every browser available for download.
Having said that, I’ll try to take a look at this later on when I have a bit more time. But we’re quite busy right now so my review may be delayed.