LG LFX31915ST Owner's Manual page 37

The shelves in your refrigerator are adjustable
to meet your individual storage needs. Your
model may have glass or wire shelves.
Adjusting the shelves to fit different heights
of items will make finding the exact item you
want easier. Doing so will also reduce the
amount of time the refrigerator door is open
which will save energy.
Tilt up the front of the shelf and lift it straight
up. Pull the shelf out.
Tilt the front of the shelf up and guide the shelf
hooks into the slots at a desired height. Then,
lower the front of the shelf so that the hooks
drop into the slots.
Make sure that shelves are level from
one side to the other. Failure to do so
may result in the shelf falling or spilling
food.
You can store taller items, such as a gallon
container or bottles, by simply pushing the
front half of the shelf underneath the back half
of the shelf. Pull the front of the shelf toward
you to return to a full shelf.
Do not clean glass shelves with
warm water while they are cold.
Shelves may break if exposed to
sudden temperature changes or
impact.
Glass shelves are heavy. Use special
care when removing them.