What is the Holiday purpose?

When I add holidays from Admin I can't see them in Scheduler view.

If I add Local Holiday for me, I can see this Holiday only for me and not for other Technicians from my Site.

In  Technician Availability Chart  I can see Holiday only created from Scheduler and only for me.

Also in Site drop-down list available only (ALL Sites, Not associated to any Sited) 

but we have about 20 Sites

SDP 9006

Dmitry