This is a File/Folder menu. You will see the main folders, Panels, Worksurfaces, System Furniture, etc.
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Left-click on a main folder, the sub-folders for that selection will appear.
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Continue to click, making the appropriate selections for that part.
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When a list of part numbers appear in the bottom screen, click once on the part you wish to select, this will attach the symbol to your cursor.
The Firecracker icon opens all folders.
The Vacuum Cleaner icon closes all folders.
The Blue F icon allows you to change the font of the library text.
The Arrow icon brings you up one folder level.