Let’s set up your first screen,

You will need an android device to run retailr & connect to your device.
If you don’t have an android device then first things you buy is a new android device
Now click on add display, you will have a this kind a new pop screen on your device.

Then, write your registration code as shown as the display, and click on verify.
once you verify the registration code, then you must add some other things on a new popup screen like,
- Give a name to display
- Select tags.
- Mention a relation of display.bb
- Select layout on 3 option.
If you choose custom layout you need to create your own managed layout, and click on add layout on a new popup screen.

You can adjust your frame size like, landscape – 1920*1080, portrait – 2160*4096, etc.
Give a specific name to the new layout.
once you have gave a name to layout then you need to add area on new page for adjustment in a new layout on display.

Click on add area and fix the area wherever you want to show.
also you can adjust it with the available menu on right side like, height, width, top and left

And click on save.