HI @lnpapin:
Firstly, I want to explain why when the user clicks the combo box to search for text, the combo box enlarges and enlarges the application.
This is a user-friendly design for mobile phone, designed to allow users to see options clearly the first time.
Secondly, there is currently no way to turn off this feature, I am sorry for not being able to help you in this regard.
In addition, maybe the following suggestions can help you:
1\ This problem will only appear when it is first loaded. After manually reducing the screen, it will not be displayed next time.
2\ I also agree that the app designer should have the right to turn this function on or off. If you want to implement this feature, please consider submitting ideas to the PowerApps Creative Forum:
https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas
Beat Regards,
Bof