How do I lock items in place, or toggle their visibility in the Render Window?
• You can’t lock them in place, but you can select certain object types to be not visible/selectable in the View > Show/Hide Window. • You can also toggle whether items are selectable or visible: select the items either in the Render Window or in the Cell View window (you can also use the Filter for this), then with the Render Window active, click “1” once to make your selection not selectable and twice for not visible. You can revert this by selecting the items in light blue in the Cell View window.