macbook pro – How can I keep the microphone switched on when dictating?

I have a Macbook Pro with Catalina. When I dictate and then pause, the microphone turns off and I have to press the fn key twice to turn it back on. When Dragon speaks, you can turn on the microphone, but that doesn't work here. I tried dictating with both Open Office and Pages, and the problem is the same. I want to use the dictation to dictate stories and it includes pauses.