I am not sure if there is a way to change how Solidworks behaves when editing a sketch in a part. When I zoom into a feature and click to edit its sketch when it enters sketch edit mode the view of the model is either in a completely different place or it ends up off screen. Is there a setting that will not move the model when clicking edit sketch of a feature? When I zoom into an area of a model I want it to stay at that same view when I go into edit mode. Im sure it used to do this? Ive been putting up with this for a while now. Might seem trivial but over time this ads up to a lot of readjusting of the view of the model for no good reason.
I'm at home now, and don't have SW here, so I'm not sure of the exact wording, but there's an option at Tools / Options / System Options that says something like "Zoom to fit when sketching". Deselect that. If you'll use the Search box in the upper right corner of the dialog box you shouldn't have any trouble finding it.