Remove added soft buttons?

Hi all.

I added 2 new soft buttons together with the on-screen navigation buttons.
I think i added this in an earlier version of android? But now they have removed the settings where i could add or remove soft keys button.

Nexus 6P
Android 8.1.0

See attached image!

Thanks for all help regarding this!!

Regards
Edvardsen

Attached Images

• Screenshot_20171101-132839.jpg (48.6 KB)