that's a shame and something i can't understand at all. it was the single most used feature of my S7E. won't buy any samsung devices any more (not just because of this, but that's the nail in the coffin)
This message "The Calendar Edge feature will be removed March 2019" also displayed on my Samsung S8. I LOVE this Feature, use it all the time, and it keeps icon clutter off the Home Screen. It would be a shame to lose this practical Samsung feature without a future replacement in development/design.
I'm reading through a bunch of threads, but unfortunately I'm not seeing an answer to the question "why?" I use it all the time, and it's very useful. Are you getting rid of it completely, or replacing it with something?
I use a workaround. All my icons are on my home page. Just one single page. (Apps in Folders sorted by type such as tools, Media, Videos, Social media...) and on the second page, I have a full page widget with the calendar. Scroll right, I have my calendar. Easier to see and just as fast to get to. Something to try maybe.