Hi Seenivasan,
Thanks for your interest in Syncfusion products
I am afraid that i am unable to reproduce the reported issue. I have created a sample to test this issue and i am able to type word in filterbar cell without having any issues and the sample is available from the following link.
http://files.syncfusion.com/support/GGC.Web/7.4.0.20/91446/main.htmPlease have a look at the above sample and if still the issue exists, could you please share your sample or try reproducing the issue in above sample.It will help us to sort out the cause of the issue and provide you an appropriate solution.
Please let us know if you have any concerns.
Regards
Lakshmi Narasimman G.