When viewing a Figma diagram through the viewer (not sure is this correct name, I mean when you preview community assets etc.) and your not hovering over an interactive element, it would be great if you could quickly Zoom In and maybe Out by double clicking in the viewport similarly to other design tools.
Example, if your Zoomed out to 45% double clicking somewhere would Zoom in to 100% and double clicking again will Zoom back to 45%.
Alternatively you could make it only zoom in by double clicking and zooming out by holding ALT down or when you have zoomed in to maximum level.