I don’t have time for videos. It is pretty straight forward. We have two languages English (the primary language) and French.
First choose any page and select “Edit with Pro” (You can use the about page).
Once the builder loads it will load in English (it is currently in French for who know what reason and all the English disappeared.)
Edit the English and click save.
Click the French Flag bottom right corner and the “French” page loads but with the text that was edited on the English page.
Edit the text in the French page and save. Go back to the English and the English page does not have the text you edited on the French (the expected result)
Now edit the English and save, go back to the French page and the English will have replaced the French.
So it seems like editing the English overrides the French, but editing the French does not override the English.
I will see what I can do about access as we require Google Authenticator to login as an admin.