Hi,

You can do that easily with the OutSystems Theme Editor

https://success.outsystems.com/documentation/11/developing_an_application/design_ui/look_and_feel/customize_the_look_of_your_app_with_theme_editor/

Regards,

Daniel 

Hi @Aman Kumar Bhardwaj 

There are 2 ways

1.To change font size  you can add the inbuilt font-size class from style

2. You can also create a custom class and assign  to the widget style class

Let me know if this helps you

Regards,

Shradha

Hi @Aman Kumar Bhardwaj , 

Fonts size can be customized using inline css (I.e which is present inside the properties tab) or you can customize with the help of CSS tab "which is present on top of the service studio" in there you can add your stylings for both "the screen" or "the whole application'.

Hope this solution helps you. 

Regards, 

Nandhakumar S.