Best practices
Use a pull-down button to present commands or items that are directly related to the button’s action.
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An Add button could present a menu that lets people specify the item they want to add.
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A Sort button could use a menu to let people select an attribute on which to sort.
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A Back button could let people choose a specific location to revisit instead of opening the previous one.
Avoid putting all of a view’s actions in one pull-down button.
Balance menu length with ease of use.
Display a succinct menu title only if it adds meaning.
Let people know when a pull-down button’s menu item is destructive, and ask them to confirm their intent.
Include an interface icon with a menu item when it provides value.
Platform considerations
iOS, iPadOS
Consider using a More pull-down button to present items that don’t need prominent positions in the main interface.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/pull-down-buttons