Which map to keep on my fenix 6s Pro?

Hi, I have a Fenix 6s Pro that I bought in the US and am using in an asian country. I downloaded free OpenStreetMap maps for my country and put them on my watch. However I have three different maps that I put on there including open topo maps, bicycle routing maps and otm maps. How does the watch know which out of these three maps to use and should I keep all three in the watch or just keep one? Thanks for your help.