How to set up custom canvas panel resolution to snap to?

Hi! I’m new to UE. I’m checking out UMG and while I click and drag my “canvas panel” to resize, some predetermined screen resolutions show up to snap to them like in the screenshot. These screen resolutions are generally 16 by 9 ratio. How can I add a custom resolution to this view like (20:9 ratio) 1080x2400 pixels alternative. Is it possible?