How to disable Polls on the chat section and show only chat tab

I don’t want to show the polls tab at chat. I need chat tab only, so how to disable the polls on UI. I have disabled the polls module on /etc/prosody/conf.avail/meet.mydomain.com.cfg.lua config file. But still showing on the UI.
Please guide anyone.

Set the following in your config.js:

disablePolls: true,