Mahmoud alali

Hello, I saw that pressing "shift + left.mouse" While requesting units in infantry and vehicle tabs, will multiple the requested units, but is doesn't work for me!! I have latest yuri 8.4 update installed.

While building infantry or vehicle; i press "shift + left.mouse", It does not multiple request unit, though i see it on the internet that it should do, What is the problem? I've installed yuri latest update 8.4.