Phone text message UI removes active phone call screen

I have SW version 2019.40.50.7 that allows my Android phone to send and receive text messages through the TM3 screen. The problem is that when I was on the phone leaving a voice mail to someone, a text message came in and the text message screen popped up in front of the active phone call screen. When I wanted to hang up the phone call, I couldn't find a place on the screen to do so. When the text message screen disappeared, the phone screen was gone also. I hit the phone icon to bring up the phone menu, but it didn't indicate there was an active call. How do you end a phone call if the active phone call screen is not visible?

I left one very long and funny voicemail

 

I tried swiping left and right and the only thing that happened is that the text message box disappeared.