Preset can not be selected

[Yu22723632vfai]

Why I can't select the preset? I can only see the preset effect when I point mouse cursor on the left preset line, when I move mouse cursor away the preset effect is gone, I can't edit my photo, what's the problem?

[johnrellis]

"I can only see the preset effect when I point mouse cursor on the left preset line, when I move mouse cursor away the preset effect is gone"

Are you actually clicking on the preset, or just hovering the mouse over it?

Do the menu command Help > System Info and copy/paste here the first ten lines so we can see exactly which versions you're running.

[Yu22723632vfai]

Yes, I actually clicking on the preset, but when I move the mouse away from the preset, the effect is gone. It's just happened yesterday.

Please see the first ten lines below:

Lightroom Classic version: 11.1 [ 202112022200-7fd1f998 ]
License: Creative Cloud
Language setting: en
Operating system: Mac OS 10
Version: 10.15.6 [19G2021]
Application architecture: x64
Logical processor count: 8
Processor speed: 2.2GHz
SqLite Version: 3.36.0
Built-in memory: 16,384.0 MB 

[johnrellis]

Try resetting LR's preferences:
https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/

LR sometimes soils its preferences file, and resetting it can fix all sorts of wonky behavior. That article explains how to restore the old preferences if resetting doesn't help.