It is a simple text editor without setting screen.
The font size is 16px, and the tab size is two blank characters.
Shortcut key
Ctrl-O:Open File
Ctrl-S:Save
Ctrl-F:Start searching
Ctrl-G:Find next
Shift-Ctrl-G:Find previous
Shift-Ctrl-F:Replace
Shift-Ctrl-R:Replace all
Shift-Ctrl-S:Save as
Alt-G:Jump to line