Hello, thanks for reaching out.
Did you already restart your PC after the update? Sometimes the new Edge version needs a full restart for settings to apply. Microsoft confirmed that some updates may reset appearance and voice features. Open Edge settings, go to Appearance, and set the theme to Dark manually. For the missing Bing Voice Command, check Privacy settings and turn Voice search back on. If nothing changes, sign out of Edge, sign back in, and let it sync again.