Enable it by installing latest.exe
Native Builder: https://artifacts.rnd.mendix.com/native-builders/latest.exe
If the “Build Native Mobile App” still comes as disabled relaunch the mendix.
Hello,
Make sure you have a Native profile. Build Native Mobile app is usually greyed out when a Native profile doesn’t exist.
Also enable it by installing latest.exe
Native Builder: https://artifacts.rnd.mendix.com/native-builders/latest.exe
then build native mobile app will display.
Hope it helps!