Hi Keith,
For me it sort of works in different directions. I often compose with OVF take the picture and look at the composition on the LCD and adjust composition . More often than not, the change is to include more of the foreground.
I also find that with the LCD on the back of the camera, when on tripod, I get a more relaxed looking at the LCD. I would say that we OVF/EVF I am more focused on the subject while with the LCD on the back I see the subject more in context. This may be very personal.
Best regards
Erik
Erik, I'll occasionally use a screen but much prefer how an EVF or for that matter an OVF isolates the frame from the surrounding dross.