Setting the FilterDirector directly:
Setting FilterDescriptor via SearchText:
Our search box is a custom TelerikTextbox not part of the grid, but essentially the same functionality as the built-in search box.
To test, use this code:
https://docs.telerik.com/blazor-ui/components/grid/filter/searchbox#customize-the-searchbox
But add it to FilterDescriptor immediately rather than setting SearchFilter like on the link.
This is the only instance of this on our site, and all of our grids use the exact same code via a generic method, on our object that controls the grid we have a custom empty attribute to dictate whether a column should be filterable via our textbox.