Swipe command selects the image swipe tool. This tool allows the easy
viewing of overlapping layers in an interactive manner by allowing you
to select a raster/ image layer to swipe away by holding down the left
mouse button and dragging in some direction. Once the Image Swipe Tool
is activated a 'Select Layer to Swipe' dialog will populate (below).
Select the raster/ image layer to swipe away. To swipe, just hold down the
left mouse button and drag in the desired swipe direction. When you release
the mouse the swipe is reset and the entire image is displayed again.
Once active, you can change the selected swipe layer by right-clicking
and choosing the option to 'Select Swipe Layer' from the menu.