I like my Panda Cross, but one of its more annoying features is how the geometry of the windscreen and dash conspire to obscure the forward view when it's sunny
Alternatively - it's 16 June. Summer's over.
I don't think that vent 'pops off' -- pretty certain it is part of the whole dash panel (having looked for exactly the same reasons)...I might see how easy it is to pop this off and either spray with matt black or a suitable etch primer to produce a dull finish. Wire wool might also work.
Maybe when I get a day with nothing else to do.