How to delete the default child_image or configure it to my own cpunet project

mcu: nrf5340

board: nrf5340dk_nrf5340_cpuapp

sdk: v2.6.1

When I configure CONFIG_BOARD_ENABLE_CPUNET to enable cpunet, there isn't an issue. However, when I configure CONFIG_BOOTLOADER_MCUBOOT to enable mcuboot in my cpuapp project, a cpunet child_image appears in the build configuration. It seems the script automatically generates the BOARD_NRF5340DK_NRF5340_CPUAPP configuration, which then adds empty_net_core as a child_image to my project. I do not need these additions. I attempted to find how it was added but found no related child_image configuration in my project. So, how can I remove this child_image or configure it to use my own project?

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