You can configure permissions for apps in a guest space. The configured permissions are applied to the users who use the guest space.

Permissions are configured in the Permissions setting on the app settings screen. You can configure permissions for individual apps, records, and fields.

In the case of apps in guest spaces, you cannot grant permissions to departments or groups that are optionally added. You need to set target users for permissions one at a time.

For details on how to configure different types of permissions, refer to the following pages:
Configuring Permissions for App
Configuring Permissions for Records
Configuring Permissions for Fields