The only visibility option that Dropbox currently offers for that is the "Only me" option. When enabled, the extension for your app will only be available to you (the app owner). When disabled, it will be available to anyone with your app connected to their account. Dropbox doesn't currently offer a way to limit that to a particular audience, such as a team, but I'll pass this along as a feature request. I can't promise if or when that might be implemented though.