Hi Carlos,
Greetings from Syncfusion.
We could see you would like to handle the overflowing content in frozen as well movable content. By default, Grid follows the Microsoft Excel behavior which will the scroller only for the movable content. The same behavior has been followed in the Essential JavaScript 2 Grid. Moreover, the name frozen content signifies that it won’t scroll the content and it will be static.
Regards,
Seeni Sakthi Kumar S