How to Reset the Registry Editor (Regedit) To Default
If you use the Registry Editor frequently, you might want to reset the size, font, position, or any other changes you might have made to the Registry Editor.
Note that you are only resetting the Registry Editor to its default size and position. If you want to backup or restore the registry, see this tutorial. Ironically, it's a good idea to back up your registry before proceeding. Finally, if your Registry Editor won't open, isn't working, or crashes, see this tutorial.
Open the Registry Editor.
Type in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit in the address bar.