While the “blocks” model makes sense for mobile layouts and contents – i found it pretty sluggish on the desktop for “quickly” updating this or that blog post and decided: i would like to have the old editor back – this blog will probably – unfortunately not migrate to a mobile layout any time soon X-D
so this is what you need to do:
2. delete your browser cache (Shift+Ctrl+Del, on German Keyboard: Shift+Strg+Entf)
3. relogin to your https://domain.com/wp-admin wordpress site.
4. edit a blog article or start a new one
5. scroll down on the right menu bar until you see: this switch editor link