Screen transmission 2 × pc tv?

I connected my laptop via HDMI to my TV. Accordingly, everything is running eig on my laptop now on my TV.

But:

Can I run (no splitscreen) while my laptop is connected to my TV on both something else? Or. Do I want to work on a laptop on a presentation while watching the TV series. Is that possible? If yes how?

This works out.

Which windows do you have?

If you have Windows 8/10 just use the following keyboard shortcut:

Windows key + P

Then click "Expand"