No one is going to have that until the ship moves there next month. You can look on the app at some other ships, like Mariner, that is doing five day sailings and assume the menu will be the same.
That was a short term issue on Wonder only. On Anthem, and reporting suggests all other ships in the fleet, Wi-Fi calling should work, despite what you might see online.
Likely the not so obvious link at the bottom of the calendar screen (Change ship/dates) when in one of your bookings or the “Browse our ships” link if looking at all your bookings.
Some individuals may report issues with Wi-Fi calling but that is a problem with their setup, nothing changed ship internet wise (even with the switch to Starlink) to preclude Wi-Fi calling from working.
You can set the app to any sailing fleet wide within final payment - the option should be at the bottom of the app calendar screen "Change ship/dates".