The Syncfusion native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
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ADAdministrator Syncfusion Team March 18, 2004 05:23 PM UTC
Those borders on headers are actually drawn as part of the cell as a 3-d effect that gives them a button appearance. You can turn it off grid-wide by setting this property
this.gridDataBoundGrid1.Properties.Buttons3D = false;
If you want to do something cell by cell, you will have to change the celltype (maybe to Static) by setting grid.BaseStylesMap["Column Header"].StyleInfo.CellType. You would do the same for "Row Header" and "Header" (top-left cell).