In Simulating Various Network Connection Speeds, I showed how to change between various simulated connection speeds from the Network tab in Chrome devtools. Unfortunately, the Connection Speed dropdown is crowded out by a number of other controls in the Network tab. As a result, unless that tab is expanded pretty wide, you won't be able to get at it. I've found myself sliding the devtools wider and narrower over and over while testing things with throttling.
There is another, easier place to access throttling.
The console drawer gives us access to a number of additional tabs of controls. Add the Network connections tab for easier access.