Hello,
To have RTL frontend you need to install Persian WP localization and activate it (Settings > Languages). To make your backend LTR install the additional plugin like https://wordpress.org/plugins/admin-locale/ , https://wordpress.org/plugins/admin-in-english/ etc. To translate or theme to Persian, you can use Loco translate plugin or PoEdit.
We are working on translation of our theme to different languages. If you could share your Persian translation we would be very grateful!
Waiting for your reply.
Regards