Thank you for the welcome and loving the Affinity suite so far! (have Photo and Designer)!
Thank you for the explanation and I apologize, but what I meant to ask is: Is there a way to adjust the size of multiple picture frames so they are all equal size. In other words, is it possible to select multiple picture frames and input width and height adjustments? Although having typed this I just realized that an option would be to set guides, turn on snap, and place all the images to the guides and then they would all be equal size and free for me to adjust as needed using the corner handle (like you suggested)