LM2576 may I use bigger or lower inductors?
The first-order effect of using a larger inductor (all other things kept equal) is to reduce the ripple current in the inductor by a proportional amount.

In a DCM (discontinuous conduction mode) regulator, this also limits the load current, since that is proportional to the ripple current.

In a CCM (continuous conduction mode) regulator, the static load current is not affected, but the dynamic response of the regulator will be somewhat slower.

The degree to which this particular chip can tolerate this sort of change requires a careful perusal of its datasheet.