Quote:
Originally Posted by theducks
A long time ago, there were 2 styles of arrows.
The one in the center for right click
a small one near the bottom for More Choices ( similar to ... on some systems)
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The two arrow styles indicate if pressing the button does something or if it just displays the menu. The small one near the corner indicates that it just has a menu. The more obvious one (can't describe it exactly as I'm at work on a Linux machine with calibre 1.48), is for the action and separate menu. The arrow is bigger and separate to allow it to be clicked separately.
From your screen shot, I don't think they are the same button. That icon is used for three different buttons. One is "Choose Library" which is used to create or change the current library. The tooltip for this will show the library name and number of books. Clicking it should prompt to create a library. This should have the bigger arrow.
The second is the "Copy to library". You can put this on the toolbar, but it only shows if you have more than one library. This doesn't have an action for clicking the button, so it should have the smaller arrow.
The third is part of the "Location Manager" button. This is only there when the device is connected. It has two or three parts that look like separate buttons, but they are one item in the toolbar. The parts are the library, the device and the secondary storage in the device. Clicking each of these changes the list to that location. Each part has it's own drop down menu, so they should have the menu-type arrow.
The screenshot with the device should be the last button. I can't tell which it is for the other screenshot. But, my memory of the library button at home on Win10 is that it has a visible arrow for the menu.