I am not sure what you mean by manually set orientation, but if you need to control the orientation supported by your AppBuilder
app, then you can do that through the project configuration. You can follow the steps in the Configure your Project
tutorial to open and modify the project settings.
Basically you can select to display your application in portrait, landscape or both orientations. If you select only Landscape
as a supported interface orientation, your app will be displayed only in landscape mode on the devices.
Please let me know if this is what you had in mind.
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