You can invite users in the share panel which is located at the top-right corner of the app builder. Type the users' email in the input box, then click Send Invite. The users will receive a email to verify their account and join the app.
User Management Panel
You can also invite users with certain role in the User Management Panel, which can be found at the top right of the App Builder. Enter the users' email and set their role, then click on Send Invite. The users will receive email to verify their account and join the app.
Share apps with collaborators
In the Data App list, you can share your app with other individuals in the same organization to collaborate.
Click +Invite to select the coworkers you want to share with and the access you want to grant. Then, click Share to share the app with them for collaboration.