If you're the owner of an Office 365 Home subscription, you can stop sharing your subscription with someone at any time.
Go to Office.com/myaccount, and sign in with your Microsoft account. This is the email address and password you associated with your copy of Office.
In the Share Office 365 section, choose Share Office 365.
On the Share Office 365 page, in the Share your subscription benefits section, find the person you want to remove, and then choose Remove.
In the confirmation dialog box, choose Remove User.
After you stop sharing, we’ll send an email to let them know that you removed them from your subscription.
I was sharing my Office 365 Home subscription with my son, Jimmie, but now that he's getting it from his school, I no longer need to.
To stop sharing, I just go to Office.com/myaccount…
and sign in with my personal Microsoft account.
In the Share Office 365 section, I choose Share Office 365.
On the Share Office 365 page, in the Share your subscription benefits section, I find Jimmie and choose Remove.
In the confirmation dialog box, I choose Remove User.
That's it. In a few minutes, I’ll get an email letting me know that I'm no longer sharing Office 365 with my son.