InDesign 2026 undo doesn't work

I installed Adobe 2026 on my imac. Now undo doesn’t work. It’s permanently grayed out. ID 21.2 on a Retina 5K running Ventura 13.7.8.

If you look at screen shot, I can’t undo the neon effect I made or undo the letter ‘M’ I deleted. 

I’m opening 2025 ID to see if that helps.