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I found the HUD break functionality to be a bit janky at times, so I usually just use ZAP without the HUD. To do that, make sure ZAP is open, navigate to the page where you’ll want to set up a break point, then click on the green circle in ZAP, which will make it turn red. Then, complete your action (like trying to submit a form, for example), and ZAP will pause the action until you step through each request & response. The way to step through is to click on the play-looking button next to the green circle until you get to the request/response you’re interested in. At that point, you can modify the request directly from ZAP.
Let me know if this doesn’t make sense and I can send over a quick video showing it!