How to create frame as boundary for a 13" x 19" print?

I’ll manage the font sizes (etc.) within it.

I just need to constrain the canvas so that I know what the theoretical maximum available canvas size is given an output physical size of 13 x 19

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@Ken Florian - You could

find any existing image that is the aspect ratio you are looking for
add it to a the Miro board
draw a frame around it
and then hold Shift when resizing the frame (if need be) as holding Shift will maintain the aspect ratio.

Here it is in pictures/a GIF:

I duplicated the board for the sake of creating this screenshot:

Resizing while holding Shift:

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