Hi,
Please refer the following link https://community.mendix.com/link/space/studio-pro/questions/93840
Hope this helps!
Hello Venkatajalapathy P,
There should be an .apk package or something within the folder you build your app in.
This APK you can download and open on an android device, then you have your app on your device.
For Apple you need a different kind of package it has the extention .ipa, but the process is kind of similar to download it and open it on your phone.
It also possible to open the apk with an emulator like bluestacks so you can test on your pc.
More information you can find here:
https://docs.mendix.com/refguide/mobile/getting-started-with-mobile/
Hope this helps,
Good luck!