In reply to Anne McCarthy.

Thanks for sharing issues/links. Those are helpful.

The missing wide and full alignments are not limited to just the Columns block. It's an across-the-board issue that I'm seeing. I've tested with the TT1 Blocks, Block-Based Bosco, and Armando themes. No blocks, including Image, Video, Columns, Group, Cover, etc. have the wide/full alignment options. When I revert to a non-FSE theme, these options return.