When you insert prototypes/wireframes with a white background, they do not stand out against the background. It would be great if you had an option to change the colour of the drawing area or add a stroke or drop shadow to the imported prototypes. Especially if you use it for flow maps with a lot of different screens.
Thanks for sharing your feedback!
I’ve moved this topic to the feedback category so our team can keep track of it and other users vote on it.
I also renamed your title to be more specific since there’s an existing feedback topic related to changing the background color: Change work area BG color
Feel free to add a vote over there!