Marquee zoom is a navigation gesture that frames a rectangular region of the glyph editor and snaps the viewport to it. It is faster than stepping through the standard zoom levels when you want to focus on a specific area.

Zoom In

Drag a rectangle around the target area. The editor zooms so the rectangle fills the viewport.

Zoom Out

A modifier-key variant of the same gesture zooms out: the current view shrinks so it fits inside the rectangle you drew.