Apps-OnStart is missing in Powerapps

[TrulsB]

Hi, 

i have just created 2 apps in two different tenants.  After the creating on both tenants i see that the Apps-Onstart is missing, so it is not possible to set initial values in OnStart. 

Any idea what is happening, and how to get access to the OnStart ?

[MartinDAZN]

It can be turned off in the app settings...