Yes, you can. Simply select disconnect in the Lumia Share application. When doing so, your Lumia also won't automatically connect the next time.
- I have forgotten my Microsoft account password
- What is a Microsoft Account?
- Why does Storyteller on my Lumia tablet pair automatically with my phone's Lumia Share app?
- Can I show images from Facebook or OneDrive in Storyteller on the LumiaTablet?
- How can I share my stories using Storyteller on my Lumia Tablet?