Dropdown Menus
Sometimes when dropping a block you will find that a dropdown menu will automatically open up as seen below.
Until you learn how to use these it is important that you close them immediately. These can get messy and break programs if you don't know what you are doing. To close it, click in one of the circled areas as shown below. The mouse should turn into a line with an arrow facing up and down when you place it over those positions.
If you misclick you could accidentally create a wire. This is the source of programs breaking. If this happens the most important thing is to take your hand off the mouse and do not click anything. Look at the top left of your keyboard for the escape (ESC) key and press it. This should destroy the wire. Once the wire is gone you can take your mouse again and try to close the dropdown menu.
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