Move the mouse pointer over the plugin window and right click or (hold down two fingers on the track pad) to bring up the context menu. Go to “Host Preferences” and enable or disable the “Use Layers” option. If the context menu does not show up, you need to enable “secondary click” for your track pad, in OS X system preferences.
The correct setting for the “Use Layers” option is dependent on the version of macOS and the host DAW. You may need to try it both ways and see which setting works. The setting is persisted per host.