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Official Plesk article does not work. So, I solved it by following the solution;

I was using Cloudflare and was able to change headers through Cloudflare GUI.
https://developers.cloudflare.com/rules/transform/response-header-modification/

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How about x-powered-by: PHP/xx ???

For those saying it's not working, check out this knowledge base article added below.
After adding:

[webserver]
xPoweredByHeader = off

to the panel.ini file you need to:

"Go to Tools & Settings > Diagnose & Repair and click repair for "Web & FTP Servers" to rebuild web server configuration."

https://support.plesk.com/hc/en-us/articles/115000385274-How-to-remove-modify-any-header-for-all-websites-hosted-in-Plesk-for-Linux-

Not working for me.
- updated to Plesk 18.0.31
- changed to xPoweredByHeader = off
- restarted the server
- the header is still there

Are you sure this setting is working?
Just upgraded to 18.0.31 and set-up the panel.ini by adding the line.
Still getting the header information "x-powered-by:"

+1 for me as well. Also remove the Server header

Apache:
## HIDE SERVER SEPCS
ServerSignature Off
Header unset X-Powered-By

Nginx:
# HIDE SERVER SPECS
server_tokens off;

Isn't this what you want?

Add feature to hide (remove) Easy removal "X-Powered-By-Plesk" header on Plesk for Windows for already created, migrated or existing domains.

I would like to hide the X-Powered-By header using GUI in nginx. Currently you can unset in Appache using by adding a single line of code "Header unset X-Powered-By"

yes please

Yeah, I think it's important, too.

Agree

Would be great! This is important in many ways.