Documentation about scopes is quite enticing:
https://grapheneos.org/usage#storage-access
"...GrapheneOS provides the Storage Scopes feature as a fully compatible alternative to the standard Android storage permissions. Storage Scopes can be enabled only if the app doesn't have any storage permission. Enabling Storage Scopes makes the app assume that is has all of storage permissions that were requested by it, despite not actually having any of them.
This means that the app can't see any of the files that were created by other apps. The app is still allowed to create files and directories, same as any other modern app that doesn't have any storage access permission...."
But I can find no way to "enable storage scopes". Help, please.