You can hide an RSS feed by changing the value of web.enabled parameter to false in the[customSpots] section of the panel.ini file.
For example, the description of an RSS feed that is not shown in Plesk may look like the following:
[customSpots]
web.enabled = false
web.type = rss
web.params.url = "http://kb.plesk.com/rss/gen.xml?&ArticleLanguage=en&Type=LastCreated&Product=8&UpdatePeriod=daily&ArticleType=all"
web.params.count = 3
Previous page
Next page
Locate page
Link to this page