Why is there a red bubble on my icon?

That little red bubble is called an icon badge. If you go to the Settings tab> View Options > Icon Badge Options you can configure what that badge represents or simply turn it off.

For the desktop icon, you have three choices. 1) Show the number of Expired Items in your inventory. 2) Show the number of items on your Shopping List. 3) Off.

Those icon badges on the tabs in Prep & Pantry work similarly. The badge next to the List tab icon shows you the number of Expired Items in your inventory. The badge next to the Cart tab icon shows you the number of items on your Shopping List. If you go to the Settings tab> View Options > Icon Badge Options you can configure which badges you see.

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