So the resolution of your stills does not match the resolution of your editing sequence.
the source viewer will always show images at actual size.
the program monitor will always lock to what the sequence is set to.
so prior to importing your still photos into your project, if you set the preference Ann notes in the previous thread….
then your stills will scale to the size of your sequence placed on the timeline. (note that your effects controls will still say 100%)
this may or may not be what you want….
and big question is…what are you trying to deliver? because that dictates how you should set your sequence up initially…