Autodesk is slowly merging Eagle into Fusion 360. If you use the "Fusion 360 Electronics" workspace, the library process is identical, but file management has changed.
She turned on the —the virtual rubber bands that show connections. Everything was green. No errors. arduino+pro+micro+eagle+library
If you want to create a custom library part specifically for your layout needs, follow these steps in Eagle: Create a New Library File > New > Library and save it (e.g., MyParts.lbr Draw the Symbol Library > Symbol and name it tool to draw a rectangle for the board outline. Autodesk is slowly merging Eagle into Fusion 360