The Simulation project settings.

The Simulation project settings can be found in the Attribute Manager's Project / Simulation menu. These are currently used by, among others, clothing simulation and Pyro simulation, and apply to ALL simulation tags not swapped out to Simulation Scene objects.
You will therefore find identical settings in a simulation scene object.

The simulation scene object

The simulation scene object can be found in the main menu under "Simulate". It has exactly the same settings as the Simulation project settings. So what now? Imagine you have the same scene in two separate simulations. After doing a lot of fine-tuning you achieve the desired result for simulation 1 with 82 Substeps. So far so good: You achieve the desired result for simulation 2 using 112 Substeps. If you had a common default you would not get the overall result you want. The solution: 2 separate Simulation Scene objects. One for each simulation with respective settings.

The following rules apply:

• The same Collision tags and Forces objects can be assigned to multiple Simulation Scene objects, while Cloth, Cloth Belt and Rope tags may only be placed once each in a Simulation Scene object.

• The elements assigned to a Simulation Scene object can only interact with each other. The various elements assigned to Simulation Scene objects do not see other Simulation Scene objects.

• The elements not assigned to any Simulation Scene object obey the general Simulation project settings. This is where newly generated tags/objects will be placed.

It is thus no longer necessary - as in the old Cloth system - to combine different, interacting garments in one object. You can simply assign multiple Cloth tags to a single Simulation Scene object.