Installing Process Designer Content Pack 4 (PCDP4) or later, it's possible to determine whether the content will be shown in expandable/collapsible groups or using tabs
The Tab style displays contents in tabs that are arranged from left to right. The Group style displays contents in sections that are arranged from top to bottom.
PCDP4 allows to have both options: group and tab. How to change that behavior:
Go to System Administration > Base System Configuration > Miscellaneous > System Information Record, under the General tab, choose the Preferred Notebook Style
The configuration in this location applies to all operators.
If you want only 1 operator:
Go to operators record, under the Login Profile tab for the operator choose the Preferred Notebook Style