Look for the "SparkFun-Boards.lbr" file. Inside this library, you will find the "Pro Micro" part, which includes both the schematic symbol and the physical footprint for your PCB layout.
The "Pro Micro" was originally developed by , and its official Eagle files are widely considered the industry standard. arduino+pro+micro+eagle+library
The most reliable source is the SparkFun-Eagle-Libraries GitHub repository . Look for the "SparkFun-Boards
To use the Pro Micro footprint in your design, you must first import the .lbr file into . Arduino Forumhttps://forum.arduino.cc Eagle Library for Arduino Pro Micro - General Electronics arduino+pro+micro+eagle+library