System Patterns are required for some Editors. For example, using a masked input for a phone number requires the Phone Number Pattern.
Owners have the ability to add System Use Patterns. However, you must ensure that you have enabled the Allow owner access to System Use Only categories application setting. System Patterns are added in the same way as normal Patterns. View our article Add a Pattern for more information.
System Patterns appear within Settings > Patterns, along with all other Patterns. System Patterns appear as grey and non-editable for Developers.