How come I can't see other computers anymore?

I used to be able to see other computers in my area, in the finder window, now I can't anymore. On any of my Apple computers.

BobHarris wrote:
Does clicking on the oval in the upper right corner change anything?
That just makes the window smaller, removes the right and top panels
Have you enabled/played with the System Preferences -> Security -> Firewall?
I didn't touch it, it's the same settings as it was before.
Are the other computers in your home? Are they neighbors? Office co-workers?
I have two other computers in my home, and they used to be listed, now they're not. Also when I take my Macbook Pro to school, I use to get a list of about 15 other computers in one of my classes, now I get none listed.
How are these other computers connected? Wifi (make/model of base station), Ethernet (switch, hub, router), over the Internet (cable, DSL, ...)?
All Wi-Fi

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