Is your feature request related to a problem? Please describe.
In the Netlify forum, someone was trying to use "New page" on a file collection. Clicking the button returned a blank page. This is by design, not an error, but maybe we could make this more intuitive for people.

Describe the solution you'd like
Don't show "New page" button on collection types it won't work for.

Additional context
https://community.netlify.com/t/click-new-page-shows-empty-page/21337/5