Quick Looting is a system introduced to expedite and streamline the loot collection process. To organize your loot, players can manage their loot containers and assign them to three categories. Items picked up through Quick Looting are automatically sorted among these containers (if configured). Selected loot containers should be placed in your main backpack.
By default, all items are picked up via Quick Loot feature. However, Premium Account players can also add items they do not want to loot to the Skipped List. Automated conversion of coins to platinum and crystal coins is only available for Premium Account players as well.
It can be changed in in Options > Control > Quick Loot Hotkey.
Manage Loot Containers is the place where players can configure their Quick Looting settings. To access that window, click on the in top right menu or hold CTRL and Right Click on any container in your equipment to see Manage Loot Containers option.
To add items to Skipped List find it by its name in the All Items List. Select it and then check in Skip when Quick Looting checkbox. Selected item will now appear in Skipped List. Same way it can be removed from list but by unchecking the checkbox. You can also hold CTRL and Right Click on any item in-game and then click on Add to Loot List or Remove from Loot List.