Select ALL - is it possible?

You have project of 30 tracks. All levels are set. But your master is over picking. What I normally do, I keep selecting all channels (hold ctrl+shift click on first track and the last one) then right click on mixer channel, select “Linked Channels” , then adjust level, then right click on mixer, select “Unlinked Channels”.
Is there a way – like in Pro Tools – for button/click “Select ALL” so we don’t have to go through all of those steps?

Probably all you need to do is take the master slider down a bit. Cubase mixes at a very high bit count, it’s only really on the way in and the way out that you have to worry about keeping under 0dB.