Inside game you can only manage the backpacks and clear the skip or accepted loot list, but you can find a list in your tibia files, just look for lootBlackWhitelist.json.
Right-click on your backpack and press "manage loot containers"
If you use the quick loot filter just make sure to put it to the option you want to pick up loot with :) You can also clear your skip loot list by pressing the button on the red. On the right of that is what you skipped ~
This was apart of the Summer Update 2020-
https://www.tibia.com/news/?subtopic=newsarchive&id=5622&fbegind=24&fbeginm=5&fbeginy=2020&fendd=24&fendm=7&fendy=2020&flist=11111111
https://www.tibia.com/news/?subtopic=newsarchive&id=5586&fbegind=24&fbeginm=5&fbeginy=2020&fendd=24&fendm=7&fendy=2020&flist=11111111
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