How do I turn off the passcode requirement on my iPhone?
Source:

Go to Settings -&gt; Touch ID &amp; Passcode.

Scroll down until you see the "Turn passcode off" button.  You'll need to enter your passcode first and then you can turn the passcode off.

This image is of an iPhone X with Face ID but the screen flow will be the same for your iPhone 8.



You might be prevented from performing many iOS and app functions by having this weak security.  I'm sure you're already aware of these implications since you decided to not have the passcode.