We'll create fresh WordPress site with LTR RTL Admin content installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Enable LTR in admin content area. Click the admin bar button to switch between RTL & LTR. This plugin adds a button to the admin bar. Clicking the button switches between RTL & LTR text direction of current page content only. The LTR/RTL state is saved in current browser only.