On Toolbar what does app:popupTheme="@style/AppTheme.PopupOverlay" do?

I'm modifying an old app I have and I noticed my toolbar has app:popupTheme="@style/AppTheme.PopupOverlay" but I'm not totally sure what it affects? I've changed the colors on the style that is defined with that name and I didn't see any changes on the screen.

Thanks.

What is Popupoverlay?

An overlay is what we now commonly call a pop-up. These are not new windows or tabs but rather displays or lightboxes that appear overtop of the main content on the page.

What is Popup theme in Android?

Specifies the theme to use when inflating popup menus. By default, uses the same theme as the Toolbar itself. theme. It is simply the theme of Toolbar .

The PopupOverlay theme is applied to the overflow menu popup. https://developer.android.com/reference/android/widget/PopupMenu.html