This is not a bug, but intended behavior. As web grid is not Excel. You can find more details in the original thread opened by Aditya with this question: https://www.telerik.com/forums/grid-checkboxlist-filter---auto-select-all-upon-entering-filter-criteria
This is related to Grid CheckBoxList Filter - https://demos.telerik.com/blazor-ui/grid/filter-checkboxlist
In Microsoft Excel, when we start typing in the Search box, the matching entries along with "Select All" are already checked. So upon typing the required criteria, the user just needs to select Ok button to view the filtered results.
In the case of Blazor Grid, the matching entries and Select All option are not checked automatically. So the user would need to do an additional action of checking "Select All". Please refer to the attached screenshots.
Is there a way to have "Select All" auto checked upon typing the filter criteria?