I wish they were so clear.
Because of how they've broken up the rules, what was grouped together in 2014 got split apart in 2024. The DM decides part is in Chapter 1. All the actual details of the hide action (which exclude that pesky little detail) are in the Rules Glossary.
It's very hard to have "the DM decides" with "we've taken the guesswork out of adjudicating hiding!" Which is what the 2024 rules lean far more before.
For comparison:
2014: (Chapter 7, Hiding sidebar)
"The DM decides when circumstances are appropriate for hiding. "
and
"In combat, most creatures stay alert for signs of danger all around, so if you come out of hiding and approach a creature, it usually sees you. However, under certain circumstances, the DM might allow you to stay hidden as you approach a creature that is distracted, allowing you to gain
advantage on an attack roll before you are seen."
2024: (Chapter 1)
"Adventurers and monsters often hide, whether to spy on one another, sneak past a guardian, or set an ambush. The Dungeon Master decides when circumstances are appropriate for hiding. When you try to hide, you take the
Hide action."