[19.1.4] Curves Custom how to get a more accurate adjustment

Curves Custom how to get a more accurate adjustment?
Good morning.
I am asking if there is a possibility to have a more accurate adjustment with custom curves.
When I am acting with the mouse, I have to be very careful to make millimeter adjustments, otherwise they affect as big variations, sometimes I find it difficult to make fine adjustments.
Thank you

Good morning.
I am asking if there is a possibility to have a more accurate adjustment with custom curves.
When I am acting with the mouse, I have to be very careful to make millimeter adjustments, otherwise they affect as big variations, sometimes I find it difficult to make fine adjustments.
Thank you
