Hi @LG,
When meetings are not private we see: Meeting name, Teams Meeting, Room Name, Booker
Are you checking the calendar of the room mailbox via Outlook?
By default if the RemovePrivateProperty parameter of the room mailbox is set to $true, you should be able to see the booker.
You can check this setting via this cmdlet in Exchange Online Powershell with an account which has Exchange roles assigned:
Get-CalendarProcessing <room mailbox name> | fl RemovePrivateProperty
If it shows false, you can use this cmdlet to set it to true:
Set-CalendarProcessing <room mailbox name> -RemovePrivateProperty $true
Below is an example:
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