How can I hide the upper left health bar?

How can I hide the upper left health bar? - Books On The Table

I'm desperate to know how to hide this health bar, it just appears from nowhere, and I tried all keys possible but it still remains:

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How can I hide the upper left health bar?

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How can I hide the upper left health bar? - Side view of adult Hispanic guy with dreadlocks in sunglasses and casual clothes with backpack and smart watch drinking yummy beverage from vivid yellow can while standing with eyes closed on street in downtown

How can I hide the upper left health bar? - Confident adult Hispanic male traveler in sunglasses and casual clothes with backpack opening can of drink while walking along pavement against blurred cars driving along street and empty crosswalk in downtown

How can I hide the upper left health bar? - A Rusty Can on the Dry Grass Ground

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