(TV) Remote app locked iPhone- how to unlock?

I pulled down the control panel and selected the Apple TV remote, to help my wife login to Netflix (so that I could use keychain to fill in the pwd). Afterwards, I cannot do anything on my iPhone. The remote app is on the Lock Screen and I cannot drag up, down, switch apps, or even turn off power. Also, I cannot answer calls or see texts, although the phone continues to display notifications for these. However clicking the notification does not trigger any action such as answering the call.

Also, the remote app doesn't work so no longer controls the Apple TV. However it does recognize button pushes with highlight and Taptic click (e.g. if pressing play for example).

How can I get rid of this remote app and restore ordinary iPhone function? This iPhone X has the latest iOS (downloaded today).