Exchange Resource room only shows who scheduled in Outlook

Apparently the default behavior of resources in Exchange is to replace the subject line with the organizer's name. I'm not going to argue whether or not that is pointless, but I will tell you how to fix it. It's a simple one-line powershell command you can run.

Make sure you connect to the Exchange (or Exchange Online) Powershell, and then run

Set-CalendarProcessing -Identity resourceName -DeleteSubject $False -AddOrganizerToSubject $False

Make sure you replace "resourceName" with the actual name of your resource. Running that will leave the original subject line intact so you don't have to check the organizer's calendar to see what the meeting is about if trying to schedule a resource.

I originally found the answer in this Microsoft support article