I'm an animator and I use Affinity Designer to create graphic elements that are then animated using video editing software.
I need to create and export (usually hundreds) of layers, and each slice has to be the size of the original canvas. Manually clicking on each slice and resizing to full canvas size is a real pain. I'd love to be able to select all of my slices and hit a button that auto-resizes to whatever the canvas dimensions are, if that makes sense. That way, if my Affinity canvas is in 1080P, I can import all of the exported PNG layers into a 1080P video timeline and everything stays exactly in place
Since Slices are already resizable and the document's canvas is known, I would expect an auto-resize button to be somewhat simple to implement.
Please add this feature as it would make Affinity Designer an amazing companion for 2D animation projects!