I have this cam setup in blueiris, and all good so far.

I'm confused on how to use the second stream.

It has two lenses - a regular one and a telephone close up.

In blueiris, the cameras show up like this.

Currently, I have two streams (two windows). One for the Main Stream (set as substream to save CPU) and the other set as Telephoto stream.

Should I set the zoomed one to motion detect, and then leave the non-zoomed one as recording all the time?

The telephoto stream is just zoomed into the center of the main picture the whole time.

My other Dahua camera I have it set to 'continuous and triggered'.