I got it. I had to uncheck "Hide Live View Displays." This is a terrible default option.
Live View was originally meant to be a browser emulation in earlier versions of DW, but Adobe is attempting to transition it into the main visual editing interface in the latest versions.
By default, the Live View Editor is functional, however, when you turn off Live View Displays, you also disable its editing capabilities.
DW has multiple options that allow you to preview your work in actual browsers, which is the best way to preview any work done for the web: Real Time Preview, Device Preview and Open in Browser.