PFT in Autopilot after start in custom position

Hello,

im training some landings and do restart quickly after a try, then the autopilot turns self on after a minute after phase showing “PFT” on display. (cessna 172 without G1000). In that PFT phase the device doesn’t respond to the buttons.
How to disable this boot thing and set initial autopilot off? It costs much time when i try so many landings and have to wait to turn that autopilot off.