Can't see computer under Locations in Finder

Hi,

I have two Macs, one an iMac and one a Macbook Pro, connected to the same Wifi network. Both are running Catalina.

On the iMac, I can see "Macbook Pro" listed under Locations in the Finder. But on the Macbook Pro, I can't see the iMac listed there.

I can, however, click Network, find the iMac, and connect to it.

Both computers have Screen Sharing and File Sharing turned on; all other sharing services turned off; and the firewall disabled.

What is the Finder looking for here that it can't find? I assume there must be some service or setting that causes a Mac to advertise its name to other Macs, but I can't figure out what it is or why it is only working on one of my computers.

Thanks,

Frank