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When synthesizing a quantum program, you can pass a maximum width constraint to the generation; for example, requiring that no more than 20 qubits are used. Pass constraints as follows: 
from classiq import *

constraints = Constraints(max_width=20)


@qfunc
def main(res: Output[QBit]) -> None:
    allocate(res)


synthesize(main, constraints=constraints)

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Optimization Parameter

When synthesizing a quantum program, to optimize the quantum program according to a parameter, set the optimization_parameter field. The possible parameters are the same parameters that can be constrained. The following example shows how to remove the width constraint in the quantum program, setting it instead as the optimization parameter. 
from classiq import (
    qfunc,
    Constraints,
    OptimizationParameter,
    Output,
    QBit,
    TranspilerBasisGates,
    allocate,
    set_constraints,
    synthesize,
)

constraints = Constraints(
    max_width=20,
    optimization_parameter=OptimizationParameter.DEPTH,
)


@qfunc
def main(res: Output[QBit]) -> None:
    allocate(1, res)


synthesize(main, constraints=constraints)