here the supportโs answer :
Hello,
Thank you for contacting Google Cloud Support.
The UX > Options > Starting View is only meant to work when the app is opened at the very first time. Unfortunately is not possible to force always the same screen, other than using the start URL: if you are using the mobile App, the app will reopen from the last windows where you left the application.
The starting view only works for the first time, for example reinstalling the application or starting the app the first time.
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