Lenovo S40-40 All-in-One - Manual (Page 51)

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User Guide
5. Push the release button toward the top of the computer as shown. Then, lift
the transformer stand up to remove it from the computer.
6. To reattach the transformer stand, insert the two tabs on the transformer
stand into the corresponding slots in the chassis. Then, push the release
button toward the top of the computer and slide the transformer stand in and
down at the same time. Release the release button to secure the transformer
stand to the computer.