Possible screen help/try this

[mobrules]

GMD Immerse in app store. I have used it on every phone I've ever had with all different types of screens. I do not have a pixel 2 but thought I would mention it.

It allows you to toggle/time out the top and bottom bar as you wish. This is a screen shot from Nexus 6P for example.

Mods if you need to move this please feel free.

 

[B. Diddy]

Hmm, interesting. You mean GMD Full Screen Immersive Mode, right? It was last updated in 2014, so I wonder if it works in Oreo ...

 

[Ca_lvn]

Interesting but hasn't been updated lately

 

[Richard Servello]

looks cool, but I don't trust small app devs....especially system style apps.

 

[mobrules]

Hmm, interesting. You mean GMD Full Screen Immersive Mode, right? It was last updated in 2014, so I wonder if it works in Oreo ...

Interesting but hasn't been updated lately

The screen shot I posted is from a Nexus 6P on 8.0, so yes it works great.
I have used it on a Z Play, Z Force, Moto G4Plus, and now on a 6P without any issues. It's always worked for me.