If you want to view more than one frame in the viewer as reference when you create drawings or to check the animation, or you want to check the movement of an element, you can activate the onion skin mode.

Six images, previous to the current one, displayed in onion skin relative mode

You can activate frames with a relative or fixed onion skin mode.

The relative onion skin mode displays frames in relation to the position of the current frame. For instance you can activate the frame previous to the current one, and any time you change the current frame, the previous frame will be displayed in onion skin mode.

The fixed onion skin mode displays the selected frame independently from the current frame. For instance you can activate frame 5, and any time you change the current frame, frame 5 will be displayed in onion skin mode.

The onion skin can be controlled in the area on the left of the frame column.