A:
1 - pull inner tray out of flex drawer
2 - turn it upside down on flat surface and investigate the tabs all around joining the two layers of the tray; make sure to label both layers of the tray to correctly join them back together later and to reposition tray correctly into the drawer afterwards. For instance, I labeled the back side of the drawer on both layers of the inner tray (see pictures)
3 - I only have a couple of flat screwdrivers so I also used a few jam/butter spreaders to help push multiple tabs; someone mentioned letting the tray come to room temperature first, that indeed helps
4 - gently go around the tray releasing the tabs in sequence and separate the two layers
5 - my tray did not have any screws that other contributors mentioned; the metal dividers were just loosely sitting between those plastic layers
6 - so I just had to lift the metal dividers up to remove them; easy-peasy
7 - flip the bottom layer on top of the top layer (upside down tray) making sure those labeled side are aligned
8 - the first long edge is easy, just work and slide the edge of the deep layer under the tabs of the frame layer
9 - now the remaining three edges will need snapped back in; I found that lifting the tray up to sit vertically on the counter made it easier to go around snapping tab by tab (sequentially) back into place
10 - just gently press both layers together at each tab to snap them back
Result - roomier drawer, no clumsy dividers, much better use of drawer space
Thank you, previous contributors, for your instructions. They really helped me.