Open the Layout Builder page of the content item on screen (/node/<nid>/layout), for a content type whose display allows per-item overrides.
Examples
When I open the layout of the content item I am viewing
And I open the layout of the content item I am viewing
When we open the layout of the content item we are viewing
And I open the layout of the node I am viewing
When I edit the layout of the content item I am viewing
Pattern
When(/^(I |we )*(?:open|edit) the layout of the (?:content item|node) (?:I am|we are) viewing$/, …)
Part of @webship-js/drupal-core-steps (github.com/webship/drupal-core-steps), a step pack for Webship-js 2.0.x.