I can’t find the [Yard] [Feet] [Inch] keys … where did they go?
It is likely that you have unintentionally switched between imperial and metric length keys. To switch back, either:
•Horizontally swipe your finger across the [m] [cm] [mm] keys •Goto your device’s settings, scroll to the bottom and select BuildCalc. The fourth setting should be “Metric Length Keys”. Switch it OFF.