This is the System library, not the User library. The app can be found in /System/Library/CoreServices/Applications. But as reader Chris pointed out, there’s a Screen Sharing app hidden deep in the dusty basement of macOS that is used by Apple’s own support personnel to remotely control Macs.
This suggestion completely surprised me, as I either had never heard of it or had forgotten about it in the years since I was an Apple consultant. This post outlines many of the suggestions in those comments, and if you were one of the readers who provided a solution, please check out the bottom of this post… At the tail end of that post was a request for readers to add their suggestions for other remote control solutions, and we were amazed at the response. As the title suggests, we outlined three ways - Back to My Mac, Apple Remote Desktop, and Parallels Access - to access and control a remote Mac. Recently, we published a how-to guide titled “ Three ways to remotely access and control a Mac“.