I want to make a movie protein+ligand by using pymol, but the scene always move. May know how to make the scene focus only on ligand? or any setting that can make the scene focus on ligand?
If you are mainly interested in the movement of the ligand relative to the receptor, you can align the receptor in the different states using Intra_fit
https://pymolwiki.org/index.php/Intra_fit
(assuming your movie is based on flipping through the states in a multi-state file)
This gets rid of the overall movement of the complex by always looking at the protein in the same way