Thats very possible, this file has come from another source. Would that cause this issue though?
I feel like this thread keeps getting into the weeds. I cannot choose a block library, I can only look at blocks in the current file. I need to be able to browse to a block library, so that I can distribute an updating block library to my entire team across 10 machines. The block library panel is, to the best of my knowledge, broken. I do not know how else I would link to a common file that contains the blocks I need. When I click the gear icon, the broken link pops up, and there is no way to close it. The blocks library tab is also the broken link.
Am I missing something very obvious about setting up a blocks library?