Lost the drop-down arrows the the buttons for the Tools Toolbar

Kinda hard to explain, but somehow i lost the dropdown arrows that appear in the corners of the tool bar buttons for the Tool Toolbar. …
I imagine there is something in the customize suction of the tool bar that allows you to group buttons together so they appear as one button with a drop down arrow in the bottom right corner… but i am not sure how to make that happen!
Any Ideas?

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