ScreenFlow User Guide | Main Window — Buttons/Meters
| Other Parts of the Main Window Crop Canvas Allows you to crop your main canvas. If you only want to show a section of your desktop, this is one way to accomplish that task. Transport Controls In the middle of the main window you’ll find the transport controls. The left button rewinds to the start of the presentation. The middle button starts or stops playing the presentation. The right button fast forwards to the end of the presentation. Master Audio Meter The middle right of the window is where you’ll find the master audio meter. To change the volume of a particular clip, you need to select the clip, then change the volume in the Audio Properties.