There is no "on/off" switch for the ProjectPoint mini client menu in AutoCAD. However, you can easily install/uninstall the mini client using the ppoint2.exe file available here:
http://www.buzzsaw.com/content/support/supportpop_software.html
Run the file and choose the "Modify" option to add or remove the mini client.
(NOTE: If you do not see the mini client on the list of components to add or remove, click the "Back" button and you should then see it.)