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This article explains how you can fix it if you cannot see your network listed.
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The Wi-Fi network names (also called SSIDs) will appear when looking for a Wi-Fi network to join unless it is a hidden network. You can see nearby wireless networks by clicking the Wi-Fi icon in the menu bar on your Mac.
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Wireless network names are broadcast so that you can know which one to join. However, I was seeing other nearby Wi-Fi networks such as my neighbors’ wireless networks. In other words, my Wi-Fi network was not showing up in my list of available networks on my Mac. My Mac suddenly stopped seeing my Wi-Fi network, even though my other devices were able to connect to the same Wi-Fi network. I recently started experiencing this problem.
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