Hi Ivalio,
Thank you for contacting Syncfusion Support.
We have prepared a sample that tries to meet your requirement. In our sample, we have bounded the Width of the CardView to the CardViewItem using ItemContainerStyle to shrink the CardViewItem when shrinking the window and also enable the VerticalScrollBarVisibility by overriding the template of CardViewItem, so that it will be visible when needed. Please download the sample for your reference.
Please try this solution and let us know if it is helpful
Regards
Senthil