Ctrl+click doesnt work


I watched a guide and it was shown there that if u select one of your control groups and then give it an order with Ctrl key pressed only highlighted units (u can switch between them with Tab) in this group will complete this order. It doesnt work for me. All selected units try to complete this order. Ctrl button works though, because I still can create control groups. I didnt do anything with my hotkeys and Im almost sure that yesterday everything was ok. Reinstalled the game, didnt help

UPD: Problem solved. There is a “subgroup order modifier key” option in Gameplay options which has to be marked. idk why it became unmarked though