Does wielding a shield use a hand

[Mathieu Legault-Forest]

So as opposed to raising a shield, which obviously uses a hand, could a player use their shield hand to as a free hand. Say a fighter wanted to grapple an enemy with his hand carrying a shield?

I'd say they could do it with a buckler, but I'm not sure for a regular shield. Would they need to stow away the shield or drop ot like a weapon?

[Qaianna]

Page 277:
'Most shields must be held in one hand, so you can’t hold anything with that hand and Raise a Shield. A buckler, however, doesn’t take up your hand, so you can Raise a Shield with a buckler if the hand is free (or, at
the GM’s discretion, if it’s holding a simple, lightweight object that’s not a weapon). You lose the benefits of Raise a Shield if that hand is no longer free.'
Based on this, you'd have to stow the shield to use the hand for anything unless you have a buckler. A lenient GM might let you hold a PEN if you're holding a normal or tower shield, but anything more than that is right out.