Sunrise Medical QUICKIE Sedeo Pro Advanced Manuel D'utilisation page 12

Seat cushion depth (Fig 4.6)
For the standard seat cushion position, use the holes in Fig. 4.7. The
cushion can be positioned one position more to the front to create
extra seat depth.
12
Sedeo Pro Advanced/Advanced UP Rev.A
Fig. 4.6
Fig. 4.7
Fig. 4.7.1