The minimap is a small overview map shown in the corner. While a visitor is zoomed in on the detail, it shows where they are in the whole place, so they don't lose their bearings.
Turn it on
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Open the Settings tab
Edit the map and go to the Settings tab.
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Turn on Minimap
Under General, tick Minimap ("Show a small overview map in the corner"). With it off, no minimap appears no matter what images you've set.
Give it a good image
The toggle decides whether the minimap shows; the image it uses is set per level on the Levels tab. Leave a level's minimap image blank and it reuses a smaller copy of that level's main image. A simplified, low-detail overview usually reads far better at that tiny size. See Adding a corner minimap image.
The minimap is one switch for the whole map, so it's on or off everywhere. You still tune the picture level by level.