You can reset Registry Editor (REGEDIT} window position, size, etc. to its default settings in Windows 11/10. To restore it, use the Reset option.

To restore or reset Microsoft Excel to default settings, open the Registry Editor and simply delete the Options key located here.

This may well be overly simple and arcane but I need to know either way...I am seeking to modify to registry settings (XP et al) back to the value of "(value not set)" in the registry and I can ...