I just had a strange occurance that even a reboot didn’t resolve and I thought I’d leave it here in case anyone would have a similar issue:
See also & Classify did not list similar items anymore – on any document, just out of the blue (as far as I thought). I didn’t know wether I accidentally hit a shortcut I wasn’t aware of or anything else.
Turned out I accidentally dragged the documents list to the bottom of the inspector. I could regain the documents list by simply dragging the list up from the bottom of the inspector/window.
