To add your App to a single display go to DISPLAYS tab. 

  1. Locate the display where you wish to add your content App and
    Click anywhere on top of the area to open the app for editing


    You can choose the correct app from a drop-down menu. 

    Scroll down or start typing the name of the to locate your preferred app.

    Choose and confirm your choice with OK

    Continue as many times as you need.


This will have affect only to a single displays content. 
Read more about managing contents on a Display group.


Adding an APP or a FLOW directly to a screen will set contents weight to NORMAL compared to other contents.
This weight cannot be altered. 

You might be interested also in Assigning a FLOW to a single display or in Adding a new content to a flow