Can I disable reader view so I don’t have to keep disabling it myself?
iPhone 11 Pro Max, iOS 14
No. If you don't click the reader view symbol when it appears in the Safari address bar or keystroke ⇧⌘R, then you have implicitly disabled it.
You posted your question in the macOS community so I'll assume your question pertains to Safari on the Mac. There is a setting in Safari > Preferences > Website > Reader that you can use to automatically open a website in Reader View. This is something that you can turn off:
Disable reader view
