When using Standard Views in SolidWorks models and assembles, the resulting view of the model is normally Zoom to fit. So, if you are zoomed in on to see a particular feature of a very long part, when you change from Front View to Rear View (to see the backside of that feature), the model will be resized to fit to screen. You will no longer be zoomed on your feature of interest.
SolidWorks offers you an alternative behavior. A toggle setting is available under Tools>Options…>System Options>View. Unselect the Zoom to fit when changing to standard views option. While this setting is unchecked, swtiching between Standard Views will no longer force the model to zoom to fit.