Holding alt does not work when changing transparency in Figma. How to fix?

Question

Figma

Hello. Everyone knows that when you hold down the "Alt" key in Figma, you can change the parameters with the mouse.
But here recently there was a problem, everything works, EXCEPT for changing the opacity.
Didn't mess with the settings. What could it be and how to fix it? It is very inconvenient to type with keys (

Answer 1

Did no one come across?)