This is where the classic Mac OS really shines: one fullscreen application which is totally dedicated to the task at hand. It's why I still favor it for many "creative" endeavors and why Apple was able to survive so relatively long with it despite the OS being a flaming garbage pile of technical debt and hacks underneath the glossy exterior.
Refreshingly so at times. Comparatively it’s very distraction free.
Whenever I fire it up to journal or fiddle with some classic MacOS development I always think, “Where did we manage to go so wrong in the last 30 years?”