Select this checkbox to move the newly created fill layer below the active layer immediately after creating it.
Select the type of fill layer you require:
The functionality from the layer panel (below) is used and not from the menu. The window for setting the fill layer opens directly.
If you hold down the Alt/Option key, the opposite of checkbox #1 is used.
A right-click on a button shows you all available functions, so you don't have to remember the keyboard shortcuts.