How to convert an IsaacSim project into a viewport-only display application?

I have built a simple robot and a scene through IsaacSim GUI, and used OmniGraphs to enable me to control the robot’s movement behavior via the keyboard. Finally, I saved it as a usd file. Now I hope to export it as a viewport-only display application and still maintain the keyboard interaction behavior, which is somewhat similar to a game.
I made the following attempts.
I created a USD Viewer App through Omniverse Kit Template and then executed the following commands:

./repo.bat launch -- --/app/auto_load_usd='myRobot.usd'

It can display the scene I constructed, but it seems that the control of the keyboard is lost. May I ask what I should do?

Isaac Sim Version

[✔] 4.5.0
4.2.0
4.1.0
4.0.0
4.5.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Operating System

Ubuntu 22.04
Ubuntu 20.04
[✔] Windows 11
Windows 10
Other (please specify):