You can set Appium Desired Capabilities in 2 ways:
Project Settings
In the Project->Settings menu, expand Desired Capabilities->Mobile->iOS (or Android). Choose the Device Name from the list and add new capabilities to it.
Setting Capabilities in Code
Using Katalon’s RunConfiguration.setMobileDriverPreferencesProperty(key, value) function. You would do this before starting your app, something like in this post:
