Hi Satyam,
As I recall the Build Native App v.1.0.120 is a bit messy…
If you play with your Default Configurations in some cases the Builder hides the “initial button” .
Try add custom configs and change the configs, you may fix the default behavior with this.
Build app for distribution and others actions, seems to be bound to Git and AppCenter.
Turning off this options his change the behavior and actions allowed
Adding the tokens for both Github and App Center enabled the possibilities again, for me.