Export one configuration file with the "Single import/export" form of the configuration manager: choose its group, then its name, and wait for the exported text. The name is the label of the option or the name of the file ("system.core"). Nothing is changed on the site.
Examples
When I export the configuration "system.core" of the group "System configuration"
When I export the configuration "Tags" of the group "Vocabularies"
When we export the configuration "Post" of the group "Content types"
And I export the configuration "Primary navigation" of the group "Menus"
When export the configuration "Default Layout" of the group "Layouts"Pattern
When(/^(I |we )*export the configuration "([^"]*)" of the group "([^"]*)"$/, …)Part of @webship-js/backdrop-cms-steps (github.com/webship/backdrop-cms-steps), a step pack for Webship-js 2.0.x.