Here's a Wix Pro Designer Tip: If you are in the Wix Editor, and you're looking for an element that's hidden or behind other objects and you can't find it, here's the easy key command or fast key to quickly tab through each element on your page. This is also very useful for finding mobile elements.
Use Wix Keyboard Shortcut:
Command-M on Mac (Control-M on PC)
This will select items and as you continue to hit Command-M it will tab or "pan" through the various elements in your mobile or desktop layout in the Wix Editor.