New Toolbar Features

The back and forward buttons allow you to move backward and forward through your views of the genome the way you move back and forward in a web browser.

The "Fit to Window" button reduces the row height on all tracks to fit all data for the region in view into the window.

It will also expand tracks (to their maximum preferred size) to fill the view, if needed.

The "Popup On/Off" button toggles the pop-up information windows in IGV on or off.