It would be interesting adding "Toggle Header/Code File" choice is the command list for creating shortcuts because used very often.
Related: "Shortcut Keys"
https://www.keil.com/support/man/docs/uv4/uv4_dg_shortkeys.htm
Thank you but there is no default shortcut not "Toggle Header/Code File" in the command list for shortcuts.
Thanks for sharing your idea Philippe, but - I am sorry - this list of shortcuts is not planned to get extended.
This is a very common request. Ideally it would be added to the context menu for the file TAB in the editor.