Sharing a library allows you to share content across companies. When that sharing is no longer needed you may want to remove the sharing access for the associated company. This can be accomplished by revoking the original invitation for sharing in your Library Shared History.
To revoke a shared library go to app.unifilabs.com and log in with your credentials. You must be a Company Admin to revoke the shared library.
Navigate to Libraries on the left navigation.
Next, select the name of the Library you are sharing. Then select the tab "Sharing" as seen below.
With the invitation selected you will be able to select revoke at the right.
Finally, choose REVOKE ACCESS as seen below.
You should see the following confirmation that the access to this library has been revoked.