On FanDuel currently, before lineups lock, you can easily mass edit lineups with the CSV edit. However once the games have started, there doesn’t appear to be any way to global player swap or mass edit a lineup. Each individual lineup can be changed, however there’s no option to global swap one player for another.
Ran into this on opening day when I had over 100 lineups and rain became a concern in the DET/CWS game. Does anybody have any way to work around this on FanDuel and global player swap after the first lock?