If your are using UE5.0 project → then add below lines to your project DefaultEngine.ini
[Core.System] UsePackageTrailer=True
Default (automatic)

or If you can’t find it, then open the Content Browser, click Settings, and tick 'Show Plugin Content'

Search “BP_MAP” and drag to add into your level


(Don’t change scales independently) and don’t worry if there is extra space they will become transparent
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It will automatically add the minimap to the screen by default.
However, if you want to add the minimap in a custom widget to customize it’s location freely:
Untick ‘HUD?’ bool in BP_Map and use the 'Get Minimap' node to obtain the minimap widget and then add it to any of your overlay, size boxes, canvas panels etc.