iCloud completely fills my Mac HD
I just installed a new 1 TB SSD in my 2015 MBP, installed macOS 11.4, and set up iCloud, which began automatically downloading files to my Mac. But it has downloaded so much that I have less than 30 megabytes of space left on my Mac. I can't save files, Mail can't function, etc. "Optimize Mac Storage" is checked in the iCloud preferences. How do I keep iCloud from filling up the drive completely? It should be smart enough not to do this—the preference pane says "Older Documents will be stored only in iCloud when space is needed." I'd say space is needed.
MacBook Pro 15″, macOS 11.4