Via the left-side tree view of M-Files Admin, you can access a JSON-based editor for modifying the behavior of the metadata card.
The metadata card configuration tool.
You can add and remove rules by using the plus and cross icons at the top right corner of the rule list, or by right-clicking any of the rules. The list is hierachical, meaning that you can add subordinate rules for further specifying main rules (or any superordinate rules).
The Name field should contain a descriptive name for the rule. The name is only visible in the rule editor.
The Condition field defines the scope of the rule in JSON. You may want to, for example, hide certain properties from an object of certain class.
The Behavior field is used basically for establishing what happens when the above-defined condition is met. For instance, when the object class is Customer, you might want to use the property groups Contact information, Subscription and Responsible employee.
For more information on defining the rule condition and behavior, see the article Configuring the Metadata Card.