My employer filed a green card petition for me but I am thinking about changing jobs. Will that affect my application

Changing jobs during the green card process can have an impact depending on the stage of your case. If your application has been pending for a certain period, you may be able to change employers under portability rules if the new job is similar.

If you leave your employer too early in the process, it could result in the petition no longer being valid. Timing is very important, so you should review your case status carefully before making any employment changes.