When im using the new photoshop the zoom by hand does not work or undo
May I ask the year and model of your Mac and iPad?
Also, which version PhotoShop are you on? (19.0.0)?
MacBook Pro (15-inch, 2017)
3.1 GHz Intel Core i7
Thank you for providing that information.
Is the pinch to zoom an issue with only Photoshop? Are you able to do it with the trackpad at all?
If you could, can you make sure your GPU acceleration setting is enabled: Photoshop Preferences > Performance > GPU acceleration.
Additionally, you could also try a Preferences reset for Photoshop. How to do this – Press and hold Option+Command+Shift as you start Photoshop.
Let me know how that goes!