I was able to trigger the issue by using quest games optimizer to launch HereSphere. On v0.12.2, the issue is present. I tested it on v0.12.3 (the new update), and it seems to have fixed the issue for me. Are you sure you're on version 0.12.3? Go to the HereSphere main menu -> user guide -> about. It should show the version number.
Edit: Looks like there's still an issue with the web browser getting cut off when scrolling down. Seems like Quest Games Optimizer is changing the DPI, and Unreal Engine doesn't detect this change (until the headset is restarted), so the positioning of UI elements gets messed up. I'll try to find a fix for the web browser scrolling.