mouse pointer turns to speaker on wave form and I cant turn it back

Can you help please, new Cubase LE user. I have a project with 10 tracks all with waveforms and valid audio output

I must have pressed an option button somewhere. The mouse pointer turns to a speaker Icon on any waveform and I can only hear that one track from that point for as long as the mouse is pressed. I can no longer hear the whole mix as output. Speaker DAW headphones all working fine… Ive lost 5 hours on this now and no idea how to get back.

I have tried other projects files and they all have the same issue so it must be a setting somewhere I would think.

any help appreciated.

I have tried the following :
turn off bluetooth as that was the speakers I was using and I am now just using headphones into the Steinberg UR22 DAW. the DAW and headphones are working fine for everything else.

I can confirm the Audio connections, studio setup I believe are correct for the DAW in Studio showing the Steinberg Asio and the bus

but still no sound
open Cubase remove preferences


open Cubase factory settings

Still no joy…

Do I reinstall from scratch?