Simulation»Mode»Measurement
When the Measurement mode menu bar selection is active, pressing the left-mouse button selects the object under the mouse pointer for measurement purposes. The cursor appears as an arrow with calipers when in Measurement mode and measurements are shown in the simulation window. Measurement mode can also be activated by selecting the circled button in the VM Mode toolbar above. While in Measurement mode, you can press and hold the Ctrl key to temporarily switch to Camera mode.