As TibiaFandom says you can only use 2 action bars in your client. Every bar has 50 slots what gives you 100 possibilities.
Currently, 2 Action Bars can be displayed on the bottom of the client, between the Game Window and the Chat Windows. The Action Bars can be hidden or displayed by opening the settings menu. Each bar has 50 slots available and each slot can be used to either send text, a Spell, use or equip an Item.
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