Hi, Automatically toggle overlay should be enabled, hence this issue. So, whenever you're making selections, it stays on, and disappears once you've made some slider adjustment. But - gets back on if you reset sliders to 0.
To turn it off, click on the three dot menu, in the masking panel, uncheck "Automatically toggle overlay". This will ensure that you don't see the overlay (incrustation) when you double click "Effect".