Joie Baby

We bought this buggy when looking for a cheaper version of the Babyzen yoyo, and read lots of positive reviews. All in all it seems to be a great back up buggy for holidays, but I am concerned that the seat doesn't seem to sit upright enough and my 20month old seems quite uncomfortable if in for long periods. I would appreciate some advice or others' experience on how you can help a toddler sit mire upright in this buggy? Thank you