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Is it good or bad practice to repeat a split button's primary action? I've searched and didn't find anything definitive. I see it done both ways.

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The rule is:

Nielsen/Norman group

  • A split button has a default action. Clicking "Insert" above performs a general "insert", but clicking on the split part opens a menu of related actions. The Zoom menu below is on a split button - clicking Stop Video performs the default action, and the split menu has several video-related actions.

Zoom call - video split button menu

  • A non-split button just opens the menu. It doesn't perform an action when you click on it. That's why you might see the label twice.

When should you use a split button? From the Nielsen-Norman article linked above:

Split buttons are for presenting several related tools if one option is used most frequently. Making the most commonly accessed option a default lowers the interaction cost to use that option since it removes the need to open the menu before selecting the item.

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