Hide My Email isn't a setting but a service. You can use it or not. If you are using a Hide My Email address which you have created you can deactivate it and never be bothered by it again.
Apple describes the service in How to use Hide My Email with iCloud+ on your iPhone or iPad and a key point is made there:
Deactivate an email address with Hide My Email
After you deactivate an email address in Hide My Email, it stops forwarding emails to you.
- Open the Settings app, then tap your name.
- Tap iCloud, then tap Hide My Email.
- Select an email address, then tap Deactivate Email Address. Tap Deactivate to confirm. This temporarily deactivates that email address for the app or website that you created it for.
You could also have a look at Use Hide My Email in Mail on iPhone - Apple Support