Removing Troops from Players in Stronghold

Hi!  We have a player who is busy and can’t participate anymore this conquest.  I tried to remove the troops assigned to him, but the minus button isn’t working.  I can’t remove the troops from any of the players sitting in the stronghold.  Now those troops won’t be available for active players for the rest of the conquest.  Would you please add a feature to remove the troops from an inactive player? Thanks!

Thanks for all the changes since the last conquest.  Great job Flare!