You have opened a project. Options > Settings > Projects > "Project name" > Display > Project group (assignment).
In this dialog, you assign a project group to a project. This activates the settings for the project (color in project data navigators, provision of additional project data navigators), that you specified for the project group in the dialog Settings: Project groups (definition).
Overview of the main dialog elements:
Select the desired project group from the drop-down list.
Note:
Two of the possible five project groups are predefined ("Project group 1: Schematic projects", "Project group 2: Macro projects"). The names of these project groups cannot be modified. If a name is also to be displayed for the project groups 3-5 behind the designation "Project group <3-5>:", you have to specify it in the user-defined settings during the definition.
See also