Wled missing segment

So just set up wled with an led strip around the top of my son’s room.

Works great.

Now tried to use segment to do a reading light over his bed. Small White section controlled separately.

I have segment 0 with LEDs 0 to 645 (all the LEDs) and segment 1 with LEDs 100 to 150

Now when I turn on segment 0 LEDs in segment 1 are not illuminated.

I want 1 switch that controls the whole strip when segment 1 is off.

Can this be done and if so how

Turn 0 and 1.

Sorry it has been a while to come back to this. I had some other issues with the LEDs now resolved.

Not sure what you mean by turn 0 and 1

Can you tell me more.