In the Layers panel, when you click the Select All circle to the side of the layer, all of the objects on that layer become selected. If you then go to the Properties panel and adjust the opacity of those objects, they appear to become more transparent yet you cannot see through them. ALSO, once you go back to selecting individual objects, or even manually selecting multiple objects, the opacity changes are not indicated in the Properties panel. Rather, they say 100%, even if you've adjusted the opacity by selecting all in the layers panel. I've attached a video for reference.
Spencer
In the Layers panel, when you click the Select All circle to the side of the layer, all of the objects on that layer become selected. If you then go to the Properties panel and adjust the opacity of those objects, they appear to become more transparent yet you cannot see through them. ALSO, once you go back to selecting individual objects, or even manually selecting multiple objects, the opacity changes are not indicated in the Properties panel. Rather, they say 100%, even if you've adjusted the opacity by selecting all in the layers panel. I've attached a video for reference.
Spencer