Go back through the breadcrumb: click one of the earlier screens of the trail, by its text.
Examples
When I go back to "Quotations" in the breadcrumb
When we go back to "Pipeline" in the breadcrumb
And I go back to "Contacts" in the breadcrumb
When I go back to "Invoices" in the breadcrumb
And we go back to "Products" in the breadcrumb
Pattern
When(/^(I |we )*go back to "([^"]*)" in the breadcrumb$/, …)
Part of @webship-js/odoo-steps (github.com/webship/odoo-steps), a step pack for Webship-js 2.0.x.