Are you using PLAY or Kontakt?
Either way, there are options to choose where you get your libraries from. On Play its on the bottom left somewhere, and with Kontakt, it is just a file browser on the left that you can point to your new sample library location. Just drag the library folder (EW stuff usually has 2 folders: an Instruments folder and a Samples folder) to somewhere else, and point your Kontakt player or PLAY to the new location. Good luck!
(P.S. It's not the plug in thats taking up so much space. The plug-in is just the software that you open within a DAW that plays the sample library. It's the sample library itself that's taking up so much space.)
EDIT: Here's a screenshot of each.