Remove Add Extra Services while making reservation

[PranjalB]

Hi i am currently working in WSD Module need one help
i want to hide the add extra services 
i have already gone through this knowledge article - https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB1187839
but it didn't worked

[PranjalB]

as of now it is working through commenting the lines on widget editor