Assuming your Lariat is like my XLT, on the left side of the steering wheel is a CC 'Set" button with a "+" above it and "-" below it to increase or decrease speed once set, however to the right of the "Set' is the master cruise control Icon button. Make sure that is enabled, then try "Set", but you need to be traveling above a certain speed, so try a higher speed like 50+ .Will double check grey indicator next time, have been looking for green like my F150. Thanks
Cruise control needs to first be enabled or armed, then set to the desired speed....
On the 2023 Owners manual, page 220, very bottom of left column..
good luck
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