Default menu preset will be applied to all pages by default.
At Groovy menu > Dashboard move mouse over thumbnail and click on the arrow, ad the dropdown menu select Set as default
Also, you can set default preset in the Global settings, and assign the defaul nav menu too
Related articles
How to assign default menu presets for a different taxonomies (pages, posts, post catergories, product categories).
How to assign the menu preset and nav menu for the different pages