There is no live preview in any view mode. I've tried with reseting my preferences, uinstaling, going 2-3 versions backwards and nothing. Select and mask works on PS2020... That's frustrating. Windows 10.
Also in 2021 I can't access select and mask whe double clicking mask on layer, this is working fine in 2020.
We're sorry about the trouble with Select and Mask in Photoshop 2021. This is a known issue with Photoshop 22.4 & 22.4.1 & our product team is working on a fix. For some users resetting the preferences has helped in version 22.4.
If you are experiencing this issue with versions 22.0 through 22.3.1 as well, you can try disabling the option to Use Graphics Processor from Photoshop by going to Preferences, then Performance. Once done, quit & relaunch Photoshop to check if that helps.
If you make a selection and go directly to the select and mask option, the preview of refine edges does work. However, if a selection is made and a layer mask is created, when we want to go to the select and apply mask option, the real time preview of edge refinement is not performed.