If you don't intend to use OVLO, set this threshold voltage to be the maximum voltage allowed. To do this connect VRef to Vin and set R3 and R4 = 2.2MΩ. This way you set OVLO to the max voltage (Vin) and the resistor prevents any unnecessary current draw.
If you don't intend to use UVLO, leave this pin open. It will automatically set UVLO to the lowest possible UVLO voltage, 4.2V.