Wtf is with the new mobile layout?

[smoth]

I hate it, can I turn this off?

[abma]

you can't.

because of update to phpbb 3.1 old theme got broken and what you see is pretty close to the default theme:

viewtopic.php?t=33312

for discussion, please use the existing thread:
viewtopic.php?f=1&t=33242