Can not put unlocked "Inner Quiet" Trait on hotbar

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Date & Time: 08.12.2021, 18:10
Frequency: always
World name: Lich
Character name: Tabena Garn
Retainer name:
NPC name:
Monster name:
Class/Level: Blacksmith Level 11
Party or solo:
In-game time:
Area and coordinates:
Housing:
Steps:
1. I have unlocked the trait "Inner Quiet" at level 11
2. I can see in under the Traits category and it is highlighted (unlocked)
3. BUT, I can not move it to a hotbar.
4. I can still l move all my actions to a hotbar (see screenshot)

https://live.staticflickr.com/65535/...9e863263_o.jpg

I have just realized, that Traits are always active. They are buffs and do not have to be executed.