Cmd+Opt+I on Mac (also found in View Menu). Probably Ctrl+Alt+I on Windows.
Assuming there is an error in the console window you may want to copy that and post it here before deleting everything as that may help the devs identify the root cause. I assumed that I broke while doing some plugin development and was in my sandbox repo so didn’t think much about deleting everything or reporting it, but I will if I see it again.
My assumption is that one of these values is unparsable, maybe something like “clojure.lang.LazySeq@7861” is almost certainly a problem. In my case, developer-mode is stored as a string instead of a boolean which is a bit odd but since any value is truthy in this context it is fine.
The logseq files db has some sort of root key but everything else was empty.