Why is the "block during game" feature missing from my Game booster?

[MartianTechSavvy]

I want to be able to stop notifications while in a game but when I open the game booster settings there is no option that say "block during game" can anyone help?

Edit: the only way I have found to do this is to set up a game routine in "Modes and Routines" Please Samsung bring back the old Game booster. 

[realaud]

For gaming, a mode is better, but a routine works, too.