Do I have the option to choose the parcel size when sending a return package? If so, how?

At SzybkieZwroty.pl you have this option (you can choose between dimensions A, B, and C). In the InPost application, the parcel size is predefined depending on the size of the parcel sent to the customer or depending on the sizes of the parcels most frequently returned to a given store. However, if there is such a need, the size can be changed when sending the return package directly in the Parcel Locker.