Steps to reproduce:

1. I upgraded Zabbix Server from v5.4.3 to v6.0 today
2. If i go to Monitoring > Hosts > (select host) Graphs
3. I have "Select" button to see the list of hosts as before
4. I don't have "Select" button to see the graphs, it disappeared
5. I can see only all graphs for that host and it is really a pain 

Result:
See screenshot...

Expected:
I expected to see as you have explained in doc in the LINK