With Ctrl pressed, clicking the button for preview mode will enter the split preview mode, with the left side in edit mode and the right side in preview mode, and the notes on both sides are synchronized.
Use Alt+Enter to enter any other note this mode will be maintained.
However, if you enter the picture, then the edit mode on the left will change to preview mode, and then use Ctrl+Alt+Left to return, then both sides will all change to edit mode again.
This creates a great inconvenience for use.
Current version: v0.12.19
Windows