One of the new functions in Firmware 4 is the capability to invert your slider movement so that you can better match your needs.
In the Handy 2, this setting will also flip the buttons and LED matrix so it makes sense for your orientation.
This feature is only available in Firmware 4 devices.
To start, download the Handy Onboarding App and connect your device.
Once connected, in the home screen touch the three horizontal lines on the top left.
Once there, open the setting menu and select slider settings.
About the middle of the page you will find a toggle called "Reversed motion", this is the toggle that enabled the reverse movement.
Select that toggle and your device will reset (For Handy 1) or automatically adjust (For Handy 2) to the new "Bottom" of the device.