You can find the preview cards on the "Models" tab (old "Store").
In the filter, click on "Contentt type" and then "Previews".
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Each of the preview cards can only be deactivated individually.
If you want to disable all preview cards, first disable all your cards in your collection. The reason is simple because only the preview cards are played.
Now click on a playing clip with the right mouse button. A selection of options appears in a circle (see picture).
Now click on the "Activation symbol" (marked in the picture).
The cards of the collection can now be activated again.
If you want to reactivate a preview card, the following steps are necessary:
Click on the preview card in the "Models" tab.
Click "Start preview".
The preview card will play, but only once.
If the preview card is activated again, click on the "Activation symbol" (see above).