If a landscape master page is applied, why can't I change the image size/object properties?

I am using FrameMaker 2022, and it seems really strange to me that when I want to change an image size, I have to change the master page to a non-landscape page, and only then can I edit the image size.  Switching master pages for this purpose alone is very time-consuming and tedious.  Isn't there a better way?  Why can't I change an image size when the master page is landscape?  

Help is much appreciated!