The grid pager generates the list based on the total count of items in the data source given to the grid and it needs to be managed like that so the correct pager is generated. If it were exposed for configuration, that would allow invalid configurations.
Could you provide some more details on what you want to achieve so I can offer a better answer? Is it, by chance, a responsive layout for mobile devices: https://feedback.telerik.com/blazor/1442883-responsive-layout-for-the-pager?
UI for Blazor