Needing help with map borders

Wanting help understanding how to remove map borders for custom missions, me and some friends were trying to mess around with hide and seek and map borders are getting in the way.

If somebody can help with this, that would be great. Thanks

Not possible to remove map borders for AVG OR AVN maps for ground units. Its hard coded into the map. Only maps that dont have this border for the ground/naval units are every other maps