If you have not already done so, click the Configure Display button to switch to Configure mode.
Press and hold down the Ctrl key on your keyboard while you click once on each object you want to select.
A multiple-object selection will look similar to the following:
TIP: If the objects you want to select are adjacent to each other, it may be easier to select them by clicking and dragging a "box" around the objects. If you want to select all objects in a display, from the Edit menu, choose Select All.