How to disable acknowledge request of ieee 802.15.4 when using zigbee?

Hello. I'm testing zigbee with 'nrf5_sdk_for_thread_and_zigbee_v4.2.0_af27f76' sdk on nrf52833. I use the light control example and catch the wireless communication packet via dongle and wireshark. I can see that the acknowledge request is active on IEEE 802.15.4 layer. How can I disable this ack so as to reduce communication interval time between two packets?

P.S I have already disable aps layer's response.

zigbee packet display on wireshark

zigbee_log1.pcapng

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