Copy source

Paste source

Remove source

Move source up in sources list

Move source down in sources list

Move source top of souces list

Move source bottom of souces list

Edit transform

Reset transform

Fit to screen

Stretch to screen

Center to screen

Nudge source up

Nudge source down

Nudge source left

Nudge source right

Hold Alt and drag the bounding box (edges turn green to indicate they are cropped): Crop a source

Hold Ctrl while moving/adjusting bounding box:    Temporarily disable source snapping (if enabled)

Move preview

Zoom preview