If you are using more then one keyboard layout, to exit turbo you should:

1. Look what keyboard layout is currently selected
2. Switch to Latin layout if non-Latin is selected
3. Press Alt-X

Too complicated path for the most frequently used hot key.

But Ctrl key combinations are working in any keyboard layout (both in GNOME Terminal and in far2l tty extensions mode). So maybe it's a good idea to switch to Ctrl-X as exit key combination? Also all other character-based hotkeys are already using Ctrl, so it would be consistent to use Ctrl for exit hot key also.

If Alt-X is needed for compatibility with old good Turbo Vision, both combinations may be enabled at the same time.

We may also just use Esc as intuitive exit hot key because it is not used currently in plain edition mode.