Grocer Avia:
Automatic use of potions is slightly different from automatic hunting and automatic use of supplies.
In the shortcut slots, next to the Soulshot there is a slot where you can put a potion for auto-use. You will see a slot that looks like a potion and a small options button. This button lets you configure automatic use.
After setting the amount of HP that is needed for auto-use of potion, drag the potion for auto-use from your inventory to the potion slot on the shortcut panel.
Now the potions are going to be used automatically.
"Tell me about automatic hunting." Ask about the automatic use of supplies "Let's skip this part and move on."