Overview
Icon Library
You will find the Icon Library in the StreamDeck app if you select one of the keys and then click the small (+) icon (or select Open Stream Deck Icon Library
under the small arrow icon) in the property inspector:
This will open a new Stream Deck Icon Library
window with a list of available icon packs.
Stream Deck already ships with a number of icon packs, but you can also create your own. Icon packs let you distribute your icons to other Stream Deck users. An icon pack is a bundle containing your icons with some additional information to make it easier to find in the Elgato Marketplace.