Side by side not working

Hi, I am trying to get the side by side view to work because I want to record my lecture, while seeing both my presentation and my audience (or at least some of it) without them hiding each other.

I have read how I am supposed to do it.

However, when I start sharing, there is no View button to select a Side by Side view from.

I have a View button as long as I am not sharing, but it does not have a Side by Side option.

In the Share Settings, the Side by Side option is enabled.

What am I missing? Any help will be much appreciated... 

I am adding pictures showing:
- View button when not sharing

- Missing View button when sharing

- Share settings