If you add a symbol from a library or linked library to a file, we'll display these symbols to you in the form of virtual pages. Virtual pages help track the symbol contents of your work at a glance right from Abstract.
It's simple to remove virtual pages for symbols you no longer use via Sketch. Using Abstract, click Edit in Sketch to open the file and select the symbol.
Once the Imported Symbol menu appears, find and select your symbol. Use the ⚙️icon to select Unlink from Library.