I actually happen to use that specific layout for all of my themes and have never encountered that issue, though I can clearly see that the allapps button is not there.
This is probably irrelevant, but how many titles do you have installed? I know that the button only appears if you have more than x amount of titles installed on the switch. I think it's 8 titles but I'm not sure.
Otherwise, what Firmware and which version of Atmosphere are you running?
actually, i have 9 titles there , and yes, the allapp button didn't show up
i'm on 10.1.0 Fw with SXOS 3.0.4