From the main editor window (terrain editor) Go to Window -> Minimap. Also, You're an idiot Bloodbath; suggesting to use a 3rd party editor just because a changeable option was set in the default editor...
I doubt jngp will fix it.
Reinstall wc3 though, should just take a few mins if you have the CD.
Like this?
Well if that's his problem just drag the bar lower and that's it.
Why are ppl suggesting reinstall