A toolbar is already hidden on this side of your screen. You can have only one auto-hide toolbar per side.

Hi,

I apologize for the delay in response and thank you for providing us with all the information.

Below are the steps I suggest you to try and check if that helps you.

Method:  Create a new user account and check.

1. Create a new user account and hide the taskbar from the system itself.

2. Extend the monitor to TV and keep the system under observation and check if you still face the issue.

If you still face the issue, reply to this post with more information.

Hope it helps.

Amit Sunar

Microsoft Community - Moderator

1. Create a new user account and hide the taskbar from the system itself.

Thank you for your reply Amit.

When you say hide the taskbar from the system itself do you refer to opening taskbar settings and setting taskbar to Auto-hide?

Hi,

Thank you for the response. 

Yes, I am referring to hide the taskbar to Auto hide. However, when you connect the laptop to your TV, you will have taskbar on both of the screen, I suggest you to hide the taskbar from the laptop and not from the TV screen on the new user account

Hope it helps.

Amit Sunar
Microsoft Community – Moderator

I suggest you to hide the taskbar from the laptop and not from the TV screen on the new user account

You mean that it matters on what screen I click 'open taskbar settings'? I would think the same settings open no matter what monitor I use when I change the setting. I am not using the laptop screen.

I have hidden the taskbar from all monitors with no difference. Creating a new user account to try this doesnt seem like a possible solution. I am sorry.

I am quite disappointed that this was never taken care of.

I still have to live with seeing this every morning:

A toolbar is already hidden on this side of your screen. You can have only one auto-hide toolbar per side.

for the rest of my life