4.5.2 Interactive selection

During picking operations, the mouse button functionality is changed. Click and drag the left mouse button to create a rectangular selection region on the canvas. Depending on the modifier key that was used when pressing the button, the selected items will be:
NONE
set as the current selection;
SHIFT
added to the currentselection;
CTRL
removed from the current selection.
Clicking the right mouse button finishes the interactive selection mode.

During selection mode, using the mouse buttons in combination with the ALT modifier key will still activate the default mouse functions (rotate/pan/zoom).