Samsung Galaxy Book Flex 15 User Manual page 21

Basics
Taking out the S Pen
Press the end of the S Pen until it clicks to disengage it. Then, pull
the S Pen from the slot.
To store the S Pen, reinsert it into the slot and push slightly until it
clicks into place.
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Replacing the S Pen nib
If the nib is dull, replace it with a new one.
New S pen nibs and tweezers are sold separately.
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Firmly hold the nib with the tweezers and remove it.