First of all, to apply this change, it is necessary to have access to the owner's account.
Very simple, you just need to follow the steps below:
1. After logging in Back4App, go to Server Settings > Core Settings > Settings, and go to the bottom of the page where you'll see the options below:
2. Then click on 'Edit details'. You will need to enable the option 'This API is public':
3. Go to API Hub page and search your API using the name from the App, example:
In this guide, you can learn how to change the status of the private-to-public API. Just to remind you, by enabling this option, all other developers will have access to your account.