One of my students recently asked me about this topic in the Creo class I was teaching, so I wanted to share with everyone in case it can help someone else!
If every time when you edit and regenerate a dimension in a sketch the image is zoomed out - often to a point where (Refit) does not bring the sketch back to the center of the screen, consider changing the environment default configuration option sketcher_refit_after_dim_modify.
When set to yes*, the configuration option sketcher_refit_after_dim_modify refits the two-dimensional section after dimension modification or when creating the first feature. The default value of this option is yes*.
Change this value to No to prevent the screen from zooming out after you modify a sketch dimension value.