From menu select Cypress: Get step definition references to choose from quick-pick menu or you can use native Find All References and Peek References to use left-panel tab.
From command palette select command Cypress: Find not used Cucumber step definitions
Typing @ in .feature file shows autocompletion with tags from configuration cypressHelper.cucumberTagsAutocomplete.tags - with focus by default. In case you have cypress-allure-plugin just set cypressHelper.cucumberTagsAutocomplete.allurePlugin and list of allure tags will be available.
