I've tried this on Windows in:
Firefox 88.0
Chrome 90.0.4430.85
Edge 90.0.818.42
I've also tried on Linux (don't remember the versions)
Firefox
Chromium
When I go to the browse map everything seems fine:
But when I click "Search" or "Pocket Queries" the entire main menu disappears:
And and piece of whitespace appears on the bottom:
I've tried disabling:
Tamper Monkey
uBlock Origins
Independent and together. B