Somehow, some time, the Stats panel disappeared from my menu display, all I have are the Inventory, Magic and Map panels. I've minimized all of them and the Stats panel isn't hiding.

I can find no option to reset things. I've reloaded saves from way back and it's still not there.

[edit]

NVM, found a backup .INI and DIFFing it showed me the value that had changed .. no idea how a 0 had become a 1.

I think you can double click on the box at the bottom left showing your current weapon to make any missing menu's reappear... either that or your health meters.

The command to hide one of the menus is to double-click the bar on top or to click its corresponding bit of HUD. If this happens in the future, simply click on your HUD:

-Fatigue/Magicka/Health bars for stats
-Weapon for inventory
-Magic item/square for magic item for magic
-Minimap for your map

And it will bring it back.