Is there a way to hide the triggers (thumbnail images) in the Composition Widget?
You could only change the appearance/the design of the trigger. That way you could make it as small as possible (1px by 1 px, transparent?) and place it where ever you like, but not outside the canvas, please. This could lead to strange movement on mobiles later, so take care to have an eye on this triggers.
Glad that I was able to help .