How to hide feed area in the agent desktop?

Hi community,

I'm following the available documentation to achieve this but when I try to create the Replacing view model module the system doesn't find any existing "Parent object" with the code OperatorSingleWindowPage.

I already created a custom package called "Test", as you may notice in the previous screenshots and I can't find anymore information about this problem.

I don't know if the more recent versions of Creatio doesn't support this anymore. I would like to know if I'm doing something wrong and if there is any other way to hide that panel.

The version of the environment I'm using is 8.0.8.4807

Thanks in advance for your help!