No, you cannot remove hosts from that screen.
but baicicly i get there a hosts that i down want to monitor and i dont want to count them in the licence OSI.
i have only 10 agents so far ans 13 ESXS and my OSI count is 42???
hoe can i reduce the amount of hosts that i dont want to monitor? (agian only 10 agents are installed)
Hosts not sending logs for a certain time period I believe do not count against your host count. Check the documentation. I don't specifically recall.