@obsida person is hiding with 30+ stealth, and moves to half cover or 3/4 cover, or a lightly obscured area can they stay hidden? same as below answer – a bit situational dependent. in general i'd allow it.
@DragonFistersCould a rogue hidden behind cover run to a target & Sneak Attack; are they hidden until after attacking or after leaving cover? hidden until leave, but Adam might rule creature is distracted