You need to open the Client Configurator

The up arrow only appears when you have the focus in the client application that requires customization.

In the Client Configurator you can then check “Disable Control Space For Current Focus”.

If you want to keep the possibility to erase the last word with Ctrl Space you also can solve the keyboard shortcut conflict by creating a command entry:

{command}{Ctrl Space}{NoSpacing}

with a shortcut of your choice. Expanding this shortcut would send the Ctrl Space command to start
and stop the audio.