After installing v11.2 (or newer), the behavior of this feature has changed. Where can I get more information on that?
Refer to the Changes in Behavior section in RPA v11.2 Release Notes:
Ability to concurrently execute robots
Multiple Basic Engine Robots can execute in Debug mode at the same time. The robot that has the execution privilege in Design mode can also run in Debug mode at the same time, so you can switch between the two modes. Only one Basic Engine Robot at a time can have the privilege to execute in Design mode.
For more information, see Robot Building > Get Started in Help for Kofax RPA.
Link to the more info reference above:
Level of Complexity
Article # 3048642