What is the button on the left armrest for and how do I use it? June 9, 2025 The button on the left armrest of the LiberNovo Omni is designed to adjust the strength of the lumbar support and activate the Omni Stretch Massage function for improved comfort. For detailed instructions on how to adjust the lumbar support, please watch the tutorial video here. Please see 0:21-0:27 . Press and hold the button to adjust the settings, then release it when you feel comfortable. If you need any additional support, feel free to contact us at japan_service@libernovo.com . Back to blog Share on Facebook Opens in a new window. Tweet on Twitter Opens in a new window.