Overview
I believe that this works in win8&10, but I did not try it, so you can think about it yourself or search some references for help.
Main
Actually, it can not be changed in the game, but we can move it to the other folder by a tool named MKlink in windows 7.I think it still works in windows 8 &10, but I did not use it, so I take example in windows 7.
It is very easy, but still you need to know the process, and you can follow those steps:
1.Find your save folder:”C:UsersXXXAppDataLocalIntroversionPrison Architectsaves”,If you have trouble here, you can find it just in the save menu at the bottom.
2.Copy the folders that you want to move, and paste them to the target folder.
3.Run CMD.exe with administer permission
4.Use this command and change it properly.
MKLINK /j “C:UsersXXXAppDataLocalIntroversionPrison Architectsaves” “target folder”
Because I changed the entire prison architect folder,so this is my command:
MKLINK /j “C:UsersXXXAppDataLocalIntroversionPrison Architect” “X:My documentsMy GamesPrison Architect”
Reference:https://technet.microsoft.com/en-us/library/cc753194.aspx?f=255&MSPPError=-2147217396