Google Ads makes it maddeningly difficult to discover where one can change the networks for a particular campaign. In this video, I show where you can find it in the 2023 Google Ads interface:
The key is to use that subtle "More details" link to get to the version of "Campaign settings" where you can change the fundamental attributes, like networks targeted.
In my experience, our "Display" sources of traffic are a bunch of gamer sites that yield zero conversion:
Low marks, would not recommend.