Dropdown Buttons
Body
Scenarios
The dropdown button is best used when grouping related operations, usually within tables. It works best when there are multiple operations with one clear primary operation.
Example

Recommendations
Choose a sensible primary operation, the 80% operation. Often this is "edit".
Keep the task link text short; preferably 1 to 3 words.
Avoid similar labels such as "Edit menu" and "Edit menu links".
API
Drupal 9, Drupal 8, Drupal 7, Drupal 6
Problem it solves
Reduces clutter on tables by condensing the operations to allow focus to be placed on the most common operations.
Knowledge Category