Yes, we can use hierarchical groups using slash "/" between parent and child like in syntax of filesystem path. But you must always use exact syntax of FullPath for each level of path - each group level in hierarchy.  Groups:  rootlevelGroup   rootlevelGroup/sublevel1GroupName1 rootlevelGroup/sublevel1GroupName2 rootlevelGroup/sublevel1GroupName1/sublevel2GroupNameA1 ...

To search your group you can use only specific fragment of name like "NameA1" and zabbix shows you exact fullpathname  "rootlevelGroup/sublevel1GroupName1/sublevel2GroupNameA1"

If you type the name from beggining to search field then full sub hierarchy is shown .

This helps

For me this also helps, but it is not that intuitive. Maybe it can be improved by making the groupname only the name and make a seperate column with parent group or something like that?

ZBXNEXT-4012 asks it for screens

Below is a simplified pictorial representation of the hierarchical setup of groups:
 

In this representation:

• "Customer" is the root-level group.
• "Time Zones" is a sub-group of "Customer."
• "Locations" is a sub-group of "Time Zones."
• "Devices" is a sub-group of "Locations."

This hierarchy allows for a structured organization of devices within Zabbix, where each device belongs to a specific group directly and may belong to multiple groups indirectly through the hierarchical structure.

The suggested improvement for the user interface involves displaying a separate column for the parent group, which can enhance the intuitiveness of navigating and searching for groups within the Zabbix interface. Additionally, the request for improved functionality in monitoring screens to include issues and status of nested host groups when selecting a parent group is acknowledged. This enhancement would enable the creation of screens that provide a comprehensive overview of nested groups, improving usability