We're sorry this isn't working for you. We can't reproduce this. Can you can figure out any pattern to when it happens (every time or only sometimes? On a particular computer? On a particular user account?) If you could take a screen recording of it (including the steps leading up to it) maybe that would help us figure out how to reproduce it. We've also added a section on attaching console logs to our helpful bug reports, so maybe including the logs might help.
Thanks so much for taking the time to let us know! We really appreciate it when the Vuo community works together to make Vuo better. In this particular case, we don't think this is a bug. ⌘⏎ is supposed to (and does) show the Node Library, but it doesn't hide it (and isn't supposed to hide it). You can hide it by pressing Esc. (https://doc.vuo.org/2.0.2/manual/the-vuo-editor.xhtml#docking-and-visibi....) Please let us know if it's not working that way for you.