Outlook Scheduling Calendar Suggested times missing.
From the Start menu, type regedit.exe in the search box, and then press Enter.
If you are prompted for an administrator password or for confirmation, type the password or provide confirmation.
In Registry Editor, navigate to: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\Options\Calendar
Right click on Calendar and select New DWord (32-bit) value.
Set the Name to ShowLegacyRoomFinder and press Enter.
Right click the new key, select Modify and set the Value data to 1.
Close Registry Editor and restart Outlook.
In Outlook, select File and then choose Manage COM Add-ins.
Enable Microsoft Exchange Add-in by checking the box next to it.
Choose OK and restart Outlook.
https://support.microsoft.com/en-us/office/how-to-revert-the-outlook-desktop-webview-based-room-finder-to-the-legacy-room-finder-e872b6f2-0d36-41ff-861d-adaab2da9c28?ui=en-US&rs=en-US&ad=US