If I'm not mistaken, you can Hold and drag the map like its a window on a computer on top left corner or bottom right. If you are playing on PS4 you can try the touchpad or L1+R3 buttons to enable virtual mouse thingy. If you actually mean the mini map, you can resize it when changing the UI (use CTRL+HOME key on windows || R3 i believe on PS4). I am sorry if some of my information is not 100% accurate as im not at home to test it myself. Hope it helped ^^