If you ever experience any software related issues with the Pixel or Pixel XL, then your first troubleshooting step should be to boot up into Safe Mode.
Here we have a complete set of tips and tutorials to teach you how to unlock the bootloader, install a custom recovery and root the Pixel and Pixel XL. There are also a number of tips to teach you the ins and outs of the software. I break these down into both generic software tips to show you all of the software features that are available, and root tutorials to walk you through the entire process from beginning to end.
Some of the root tutorials will need to be done in a certain order. For example, you’ll need to install a custom recovery before you can root the Pixel or Pixel XL. So in those cases I specifically mention these requirements when writing up a tutorial. The same is said with root applications too. If an app or a tip requires root access, then I will mention this and then link you to the guides you will need to follow first.