Steps to reproduce:

1. Create a new widget of type "Host navigator" on the dashboard;
2. Click the Select button for Host groups;
3. Look at the list of host groups (No groups for templates):
4. Click Cancel and then type Z into input field;
5. Look at the suggested list of host groups to choose from:

Result:
The suggested list of host groups contains host groups "Templates" and "Templates/Virtualization" in addition to "Zabbix servers" (wrong).
Expected:
The suggested list does not contain groups for templates.