Hi Dana,
Greetings from Syncfusion support.
Your requirement of persisting selected records across pages can be achieved by enabling the persistSelection property of the Grid’s selectionSettings. For persisting selection on the Grid, any one of the column should be defined as a primary key using columns.isPrimaryKey property and a checkbox type column needs to be defined.
We have prepared to demonstrate this case for your reference. You can find it below,
More details on this can be checked in the below documentation link,
With this enabled, you can retrieve the selected records across the pages.
Please get back to us if you require any further assistance.
Regards,
Sujith R