You find only one button in the Collision group, as shown in the following image:
Enable All: This toggle button allows you to choose one from two predefined options (Enable All and Disable All). The icon of which changes with each click and cycles between two states; the currently displayed value presents the state which will be applied if the the user clicked it. By default, collision is disabled.
SimLab Composer allows you to enable and disable each Solid individually by using the its independent Solid Properties Panel.
