Hello. I’ve been looking through the forums trying to figure out how to resize the mobile off-canvas menu Icon toggle and make it larger. I haven’t managed to find anything relevant on the forums.
The size of the logo for the mobile header is adjusted through Appearance > Customize > Layout > Primary Menu’s “Menu Item Height”. Increase its value if you want to make it larger.
As for the hamburger icon, you can change its size using this CSS: