The next point of view can only be shifted
1.12.2

Could you explain that a little more in detail?

You do mean:

1. You cannot hold down the buttons to ajust the perspective and therefor have to press multiple times.
2. The camera adjustment stops at a certain point

YES

Do you mean both or 1 or 2 ?

1

That is, when you move the perspective, you need to click a little bit to change the perspective

The angle of view can change infinitely as long as you press it all the time
And then I kept pressing, just to change the perspective

This is infinite change. The perspective keeps pressing and moving
My perspective, however, has changed only a little

Well the 1.12.2 versions of forge are end of support. Due to this i am unable to change the mod in any way.

OK