Blazor Grid - Popup Editing - Telerik UI for Blazor
 <GridSettings>
        <GridPopupEditSettings MaxWidth="600px"
                               MaxHeight="300px"
                               Class="custom-popup">
        </GridPopupEditSettings>
        <GridPopupEditFormSettings Orientation="@FormOrientation.Horizontal"
                                   ButtonsLayout="FormButtonsLayout.Center"
                                   Columns="2">
        </GridPopupEditFormSettings>
    </GridSettings>FormButtonsLayout