When you are in the simulation tab, the shift key activates the simulation.
You can activate the dynamic deformation by moving on the garment. The selection can be a single vertex or by a sphere containing the vertices included in this sphere.
You can move the vertices in a plane parallel to the screen or on a line perpendicular to the screen by pressing the control key (with the shift key).
When the program switches to "dynamic deformation" mode, inertia is unchecked because mouse movements could generate too much energy if inertia was active.
When you release the mouse and continue to press the shift key, the simulation continues without inertia but you can reactivate it by clicking on the inertia box.
If you release the shift key, the simulation stops but you can restart it by clicking on the "static simulation" button.

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