TT3 connect a 2nd language menu?

I have Polylang Pro set up on a WP.com site running TT3. (I have added a Child Theme to enable 2 Google Fonts not included with TT3. That’s the only change.)
I am able to switch between English and French pages using the Language Switcher. i.e. pages are synced.

I have created 2 Navigation Menus in the Site Editor:
https://staging-2aaa-acn2023.wpcomstaging.com/wp-content/uploads/2023/09/Polylang-TS2.png

ENGLISH
https://staging-2aaa-acn2023.wpcomstaging.com/wp-content/uploads/2023/09/Polylang-TS3.png

FRENCH
https://staging-2aaa-acn2023.wpcomstaging.com/wp-content/uploads/2023/09/Polylang-TS4.png

However, I cannot find any documentation or other forum posts that show how to connect the second menu using the Site Editor….
So on French pages, the English menu displays like this:
https://staging-2aaa-acn2023.wpcomstaging.com/wp-content/uploads/2023/09/Polylang-TS1.png

I have tried the following:

1. Create a new Page Template (Page-FR) and add the French navigation to the Header via the template Result: the French menu appeared on all pages, even before the template was added to Pages
2. Editor > Patterns > Header> Navigation Result: changes the menu on all Pages site-wide
3. Editor > Styles > Blocks > Language Switcher Options limited to changing text colours (Global or local)
4. Created a new navigation menu – success, but how to connect it so that this menu (and a FR footer) always appear on French pages?

The page I need help with: [log in to see the link]