Enhancement: Notes Markdown preview under text

[The-Ducktor]

The Markdown preview on tablets or desktops currently pops in from the side, causing a less optimal user experience. The current placement is awkward and may not utilize the available space effectively.
I propose relocating the Markdown preview under the text input. This adjustment aims to enhance user convenience and better utilize the available space. Placing it under the text input would not only improve usability but also fill up the empty space more effectively.