Is your feature request related to a problem? Please describe.

I'm sure this is part of a roadmap I use bootstrap which has different breakpoints than wordpress.

Describe the solution you'd like

I like away to modify the gutenberg/packages/edit-post/src/components/preview-options/index.js and add/modify MenuItem.

Instead of Desktop / Tablet / Mobile -> I'd like to use bootstraps

Extra large devices / Large devices / Medium devices / small devices: https://getbootstrap.com/docs/4.4/layout/overview/#responsive-breakpoints