Don't mind the weird opening. It's just for demonstration.
Glitch in layout Opening Explorer

I think the image speaks for itself, but as you can see, the board and the panel on the right hand side are overlapping, making it very difficult to read.
What kind of device, browser and browser version?

Though, if you have your browser window less than full size, or your zoom higher, that might happen.

Browser is Firefox, so I suspect that is the issue. It's also maximized. Still, I think it should work on firefox.

I can't recreate on my version of Firefox, trying a variety of methods, so it may be an issue on the version you're on. You might try in private mode and/or disabling any add-ons you have.
Also, if you haven't already, try clearing your browser cache.

I have no plugins. Just the most vanilla install of the version specified. I do have an external screen, though. That might be the issue. I'll disconnect that one and see.

had this issue with Chrome 110.0.5481.100 on a Macbook pro but not whilst using incognito mode, so turning this on might be a workaround for some.

had this issue with Chrome 110.0.5481.100 on a Macbook pro but not whilst using incognito mode, so turning this on might be a workaround for some.
If you don't see it in Incognito, it could be a browser cache problem, so clearing your cache on a regular session may help. Though, it could also be a plugin/add-on
I think the image speaks for itself, but as you can see, the board and the panel on the right hand side are overlapping, making it very difficult to read.