

Hello RADONAMANDIMBY Imavomialy ,
Both these options are disabled by default because they are not required by "normal users" or to phrase it the other way, these 2 items are administrator applications.
PI AF Collective Manager is needed to form an AF Collective from multiple independent AF Server installations. AF Server Collective is a High Availability option. Please refer to High Availability (HA) options for PI Asset Framework (PI AF)
The Management Plug-in for PI System Explorer (PSE) is to maintain PI Analysis Service and PI Notification Service. Please refer to Management plug-in in PI System Explorer
Management plug-in allow you to see and manage the analyses using PI System Explorer.

AF Collective Manager allow you to control and manage AF in a collective environment; a collective is more than one server to share the load, they are accessed using the collective name.
Installing or not has no affect on the AF system; it merely allows you administrator access.
thank you so much for your reply