Viewport history and marquee zoom
This features were requested quite a long time ago. We implemented these recently and now all of you using the latest version of Earthlight can take advantage of them.
Viewport history allows you to move between recent map views back and forth.
The marquee zoom tool on the other hand allows you to zoom in on the map by drawing a rectangle.
When you click the marquee tool (the magnifying glass icon) the map will be covered by a semi transparent grey veil.
Click and drag anywhere on the map to draw a rectangle.
Once you free the mouse button the map will zoom in to the marked rectangle.