As parts in the normal mode, slices must be selected, if you want to edit them. A selection of slices is assembled similar to the selection of parts in the normal mode. You select slices by clicking on their edges, on their names in the project tree or by dragging a selection rectangle around the slices you want to select. Selected slices are always framed by a green, rectangular selection box, with highlighted corners and centers of edges.
If you select slices in the screen and hold the Shift key, slices are added to the selection by clicking on them. If you hold Ctrl, slices can be both added to or removed from the selection by clicking on them. If you hold Shift and select slices in the project tree, clicking on a slice file selects all slices in the list between the selected slice and the slice you click on.