A320 MAX CLB after flex takeoff?

[TotalBeginner]

On the A320 family of aircraft (CFM56), is it possible to select MAX CLB thrust for improved fuel efficiency following a flex takeoff?

I was under the impression that selecting LVR CLB at thrust reduction altitude should not result in a thrust increase. However on a recent easyJet flight, I noticed that a few seconds after flap retraction, the engine thrust note increased. Is this a customisable option within the software or pilot selectable?

[OPEN DES]

MAX CLB thrust rating on the CFM A320 increases passing Mach 0.30. This to allow for greater Flex reductions to be achieved whilst ensuring that MAX CLB < FLX.
Hope this helps.

[TotalBeginner]

Yes, thank you for the explanation. :ok: