Adjust discovered devices after adding/removing them?

Hi everyone. I’m brand new here. I just got my system installed and it discovered a bunch of stuff in my house. I also integrated Control4 and Hubitat. When it discovered those devices (I had to do a custom integration for hyubitat) it brought in all the devices and entities that were available in them. This is all fine and dandy.

Now, I’ve recently removed a light switch from Control4. But it still appears in Home Assistant. What should I do to ensure that Home Assistant is in sync with the changes I’ve made in Control4?

Likewise, I recently added a new dimmer to Hubitat. Now that I have a new device in Hubitat, how do I get Home Assistant to discover the new device?

I’m sure this is a very basic question, but I’m struggling to find similar questions and answers on this topic. Not sure exactly how to formulate an appropriate google search for it either.

Thanks for any help!