Log out with the "Log out" link of the administration bar.
Examples
When I log out from the administration bar
When we log out from the administration bar
And I log out from the administration bar
When I sign out from the administration bar
And we sign out from the administration bar
Pattern
When(/^(I |we )*(?:log|sign) out from the administration bar$/, …)
Part of @webship-js/backdrop-cms-steps (github.com/webship/backdrop-cms-steps), a step pack for Webship-js 2.0.x.