Cant't find variable listen_port

I could not find any variable named listen_port in the vsftpd_v1.conf file.
I used ctrl+F but did not get any results. what should i do?
should i add a new variable?
AND do i have to change the variable -->

** # Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES **

to NO ?

Hi @vishalbihani2
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