The dumbbell standing Arnold press adds a built-in rotation to a normal shoulder press, starting with palms facing you and finishing palms forward overhead. That rotation works the front and side deltoids through a slightly longer range of motion than a standard press, which is why it became a staple accessory movement for shoulder size.
Log your dumbbell standing arnold press sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.