In a file context-menu and well as File main menu, there's Edit submenu, where all editors are listed, including the Internal Editor.
https://winscp.net/eng/docs/ui_commander_menu#files

For the internal editor, where's even Ctrl+Alt+F4 keyboard shortcut.
https://winscp.net/eng/docs/ui_commander_key#file_management

Hi,

When I'm making a small edit to a file, I want to use the internal editor instead of opening the external editor. Can you make a option to do that, maybe an option in the menu when right click on the file, or a keyboard shortcut like Shift+Enter.

Thanks!
Raddy