Hi @prabh_aircall  Eden from the support engineer team here.

It is expected behavior that clicking that “Cancel” button will automatically redirect you back to the last page you were on with the App’s details. Can you give us more context around why you wanted to add your own redirect URL for that button? You will not be able to install apps that require authorization without clicking “Authorize access”! 

Hello, 
I wanted to add to this discussion that in our case, the cancel button doesn’t do anything. 
The ideal behavior for us would be that the tab closes when the user clicks “cancel”, because the OAuth consent page opens in a new tab.
How can we accomplish this?
Is there a way to control cancel button behavior?