Latest update completely breaks the map manager, it's gone from the interface. Reinstall / reboot pc and fenix 7 watch makes no difference.
Uninstalling and reverting back to 7.26 immediately resolves the issue.
it's gone from the interface
I'm on 7.27 with my non-pro Epix (Gen 2) and can see the manage maps button.

Do you not even see this button, or is it just non-functional? Could you post a screenshot?
Is the display resolution on your computer less than 1024 x 768?
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Suggest contacting Garmin Support directly to report the issue.
Contact Garmin Support directly to report the issue. The phone number and contact options will vary depending on your region and time of day.