When setting the default box, my protein is not centered. Can the protein be adjusted to the center position?

After NVT equilibration, I noticed my simulation box became deformed. What could be causing this?

And the solvent box is disproportionately big for my protein system.
When setting the default box, my protein is not centered. Can the protein be adjusted to the center position?
After NVT equilibration, I noticed my simulation box became deformed. What could be causing this?
And the solvent box is disproportionately big for my protein system.