Many designers need to markup their screen sketches. But the margins have WAY too little space to do so. I’d love to be able to resize margins or have space to write on the side or make a comment somehow.
Welcome to Mockup Community!!
We totally understand the point you’re referring to regarding leaving comments or notes to markup up your sketches and so on.
What we suggest and recommend you to do is to take advantage and use an empty frame next to the one you’re sketching and working on:
Tap on “Hide Frames” option found in the Quick Actions button of the unwanted frame.
When you tap it, the frame disappears and you can use the space to take notes and write down your comments.