Save the layout on screen with Layout Builder's own "Save layout" button, which writes the override (or the default layout) and returns to the content item.
Examples
When I save the layout
And I save the layout
When we save the layout
And we save the layout
Then I save the layout
Pattern
When(/^(I |we )*save the layout$/, …)
Part of @webship-js/drupal-core-steps (github.com/webship/drupal-core-steps), a step pack for Webship-js 2.0.x.