Hello, you can go in the “properties” tab, and change the layout, the title etc…
Hi Rachana,
I suggest you take a look at this Documentation on how to use custom styling in your application:
https://docs.mendix.com/howto/front-end/customize-styling-new/
For your specific case, if you want to apply styling only for specific pop-ups you can use a custom class like .custom-popup and use this class to style your pop-up.
If you want to use styling on all pop-ups of your app, you can access .modal-dialog