Solid State Logic UF8 User Manual page 76

Studio One Tutorial
Function Select Keys 1-8 (F1 - F8)
User Bank 5 is pre-assigned to F keys 1-8. The functions of the F keys can be changed in Studio One in the External Devices
window (the same window used to assign plug-in parameters to V-Pots). If you have changed an F key away from its default
assignment, you can of course re-label the key in SSL 360° using the Short Label text entry box, so the correct function names show
on UF8's LCDs.
Right-click on the button and click 'Assign Command...' to change the function
of any of the F keys.
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SSL UF8 User Guide