I no longer get a prompt when I delete a page: there is content within the page?

[dublove]

I no longer get a prompt when I delete a page: there is content within the page?

It seems one day, I pressed the Alt key and then clicked the delete button, and I won't be prompted later.
Where do I recover it?

[Robert at ID-Tasker · Accepted solution]

In Preferences - "reset warnings" or something like that..

Point 5: 

https://helpx.adobe.com/indesign/using/setting-preferences.html 

The one on the left: 

[dublove]

Thank you.
I've seen it before but never cared.
Another trick learned.