Need help in workable area layout

Can we have a layout markings? Or an option to choose different colour to differentiate the workspace vs layout screen? I understood that is selected as 9:16 but I need to see a gray area or checkbox area to know where videos are cropped. It would be helpful if you include an option to see the bleed line/ layout markings in contrast color. Currently, layout area and outer both are black color. It would be helpful if you can include a "preview" on top of edit screen.