The five discovery decks placed on the left side above the game board (Planetopedia) are the small cards, and during my games the cards slid around a lot. A solution is to use a tray that holds the five decks! Someone did this and shared it:
Personally … I would buy one of those! (I don’t have a 3D printer). Great idea! Here is the original post with replies:
=> 3D Printed Discovery Decks Tray
They also made a long tray for injury cards, but I don’t see the use for that since it really is just ONE deck of injury cards (which I just kept in alpha order).
My ISS Vanguard 
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