Hi François-Régis,
You can modify the font-size and color of the filtering input by applying CSS to it. You can access it as following:
I have also created a sample Dojo project which demonstrates how this could be implemented. You can find the Dojo here:
https://dojo.telerik.com/ImOhiFIS.
If you have different requirements or you need further assistance, do not hesitate to contact us back.
Kind regards,
Tsvetomir
Progress Telerik
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