The Library is the place where you put your custom Content.
In the begining, the Library it's empty.
I think you will try to find is the Content Center, where you have the standard parts, bolts, washes, etc.
For install the "Content Center", you have to run the installation setup and search the Content Center Tab. Chose what you want to install from that.
You can insert them in assemblys using "Place from Content Center".
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