As much you love connect apps into your drive to help you , some apps need to be disconnect because you either you connect them to test them , and wasn’t one for you , or you are no any more using them and your list is crowded .
So, here the steps of how to get disconnect those apps to connect or reconnect them when do you need.
Step 1: Go to Setting wheel icon >> Settings
as shown in below animation
Step 2: will pop up Setting Box window as below
Step 3 : Select Manage Apps from side menu
Step 4: A list of app will show up , beside the App you would like to disconnect their is a little Gray button written over option Click over it and Select Disconnect from Drive
and here you go , your app is disconnected from your drive.