Editing : Edit Modes and Tools : Zoomer Tool : Single Zoom Mode

Single Zoom Mode
Single Zoom mode returns you to the previously selected tool after a zoom has been performed.
For example, when using the Smart Tool you can click the Single Zoomer tool, and once the Zoom operation has been performed, Pro Tools automatically switches back to the Smart Tool.
To use Single Zoom mode, do one of the following:
*
*
Right-click on any track and select Tools > Zoomer Tools > Single Zoom.
*
Single Zoom is identified with an arrow to the right of the Zoomer icon.
 
Normal Zoom mode does not have the arrow.