SanjivMeher
Mega Patron

There are several thread which can help you create a UI page to display the pop-up. You can use the solution based on your requirements.

https://www.servicenow.com/community/developer-articles/custom-ui-page-in-a-popup/ta-p/2319550

 

https://www.servicenow.com/community/now-platform-forum/how-to-create-a-popup-dialog-box-on-a-ui-act...

https://www.servicenow.com/community/itsm-forum/i-want-to-cancel-confirm-window-after-clicking-cance...

 


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