You could probably hard-reload the page and it'll reset without the cache! Alternatively, you can delete the website from the sidebar or clear cache in settings, maybe?

When I drag my tabs to switch order/create a new window they don't move and sometimes just close the tab. And ctrl+shift+T doesn't reopen the tabs either, and searching for these hidden tabs doesn't show up anything.

On top of that, the dragging to other workspace flag doesn't work either.

I'm on a MacBook Pro, extensions all disabled doesn't fix it. Sometimes quitting and reopening OperaGX a few times does. This usually happens after I haven't closed GX after a period of time (i.e. maybe a few days).