Solo: This button appears above the track heads in the Timeline. When active (orange), it lets you view the selected track in isolation, without taking into account the effect of any clips in the track above or below it on the timeline. By clicking the menu arrow beside the button, you can also choose to view the selected track and only the track that appear below the selected track.

Full screen: This button appears in the upper right corner of the Preview panel. When active, this button scales the preview image to the size of the current monitor and removes other tools from view. To exit the full screen mode, press Esc, or use the close (X) button at the top right of the window. The full-screen view includes its own small overlay panel of transport controls.