Unity Problem Scrollbar Size Automatic

I wanted to know how to disable the automatic size of the scrollbar
Or handle, I’m having the biggest problem because of this

Jump to the 3:00 frame that will see the error

truth, and the only way I can solve it was by doing my own scrollbar myself

I have the same error and looking for solution.
It automatically changes the size of the scrollbar handle when I click Play. After I fix the size (let’s say to 0.2) and hit Play, then it resizes it to 0.7671875 everytime.

Maybe submit a bug report and post it here, that way we can track the progress.