I think what you want is "No Lock" I use it and it works great, plus it is FREE
if you mean the slide to unlock screen you get when your phone goes to sleep after a minute or so. Also you can go to setting>Display>screen time out and set it to up to 30 minutes to give you more time until it automatically goes to sleep, but keep in mind it uses more battery. The no lock will not change the sleep time out, but will bypass the lock screen coming out of sleep mode, meaning when you hit the power button, it goes to your last display or open app, no slide to open screen. You get it when you first power up from a cold boot, but not after that...