I have a question about my display screen
I have a ZTE Avion Trio phone running Marshmallow 6.01. I currently have 3 display screens for my app icons. Below the display screen are 3 circular buttons. When I first got my phone, if I was on screen 3 and wanted to go to screen 1, I would just press the middle circular button and the display would move to screen 1. But now for some reason, if I press the middle circular button, it moves to screen 2. How can I adjust my settings so that when I press the button, it moves back to screen 1?