Hi Maria,
Thank you for contacting Syncfusion support.
We would like to let you know that you can customize the selected items in SfListView based on your requirement. Using IValueConverter, you can change the Color of the BoxView in accordance with the bool value of the IsSelected property. You can refer the below UG documentation link for more details.
Please let us know if you require further assistance.
Regards,
G.Muthu kumaran.