I’m trying to figure out how to synchronise a left and front view so objects appear the same pixel size. This is useful for raytrace rendering with viewcapture to file.
You can also toggle the use of linked viewports - in which case all parallel viewports zoom simultaneously at the same zoom level when you zoom in one of them. This is the macro:
'-_Options _View _LinkedViewports _Enter _Enter
The button is here:
LMB is '_SynchronizeViews, RMB is toggle linked viewports: