Define system fields in Qlikview

There is a "Show Systemfields" option in User Preferences, Settings . If you check this option, you can select the System field when you create a new List Box . Or not. So how do you define system fields?

As shown in the following code:

After hideprefix= "_" is defined, all fields whose names are prefixed with "_" will be treated as system fields. As shown, you will not be able to see the _test4 field when you create a new List Box .

After checking "Show System Fields" in User Preferences , create a new List box "_test4". Note here that any selection values in the System field "_test4" will not appear in "Current selections" at this time.

Define system fields in Qlikview