Can't answer for the V90 but on my first 740 many moons ago (the only one i've had with the extra seats), there was a fairly obvious (when you look for it) catch that if memory serves, released the cushion part so it could swing up to the backrest and leave unimpeded access to the spare wheel.
Was nearly 20 years ago now so might have the details wrong, perhaps check in your handbook, after all it got in there so it must come out..........
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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