If for some reason you want to forget all networks, pressing cmd + A works to select all followed by clicking the – button. You can select multiple networks by holding the command key while clicking and batch the process 😄.
Select a network you’d like to forget and click the “-” icon as shown below. We’ll also look at how to set priority levels for networks. In addition to manually forgetting wireless networks, we’ll dive into how to adjust your Mac’s settings on how it handles discovering and connecting to new networks. Whether you want to do some general tidying up, or have a specific network you want to forget, follow along below.
Over time, your Mac will likely build up a large amount of networks that it has connected to.