The partition of nrf5340 audio application

During my test of the nrf5340 audio application which in the V2.6.0 SDK, Because of i need to store at least 13K data to the flash.

But when i build the project, i found the "\build\partitions.yml" file shows that.

EMPTY_0:
  address: 0xfe000
  end_address: 0x100000
  placement:
    after:
    - settings_storage
  region: flash_primary
  size: 0x2000
app:
  address: 0x0
  end_address: 0xf6000
  region: flash_primary
  size: 0xf6000
nvs_storage:
  address: 0xf6000
  end_address: 0xfc000
  placement:
    before:
    - end
  region: flash_primary
  size: 0x6000
otp:
  address: 0xff8100
  end_address: 0xff83fc
  region: otp
  size: 0x2fc
rpmsg_nrf53_sram:
  address: 0x20070000
  end_address: 0x20080000
  placement:
    before:
    - end
  region: sram_primary
  size: 0x10000
settings_storage:
  address: 0xfc000
  end_address: 0xfe000
  placement:
    align:
      start: 0x4000
    before:
    - end
  region: flash_primary
  size: 0x2000
sram_primary:
  address: 0x20000000
  end_address: 0x20070000
  region: sram_primary
  size: 0x70000
You can see there is only 0x2000 size for "EMPTY_0", but the app size is almost close to 1M.
But i want i can use at least 0x4000 size, But I dare not use 'settings storage' because I think the project may have used this partition to store some settings.
And i found that seems like the project enable the "USE_PARTITION_MANAGER", which i guess that makes the partition for flash0 in the device tree files invalid.
And I can't find where to adjust the size of these partitions. If i can, I think maybe I can reduce the sizd of app partitions appropriately.
So if i do not want to use the external flash, what should i do now?
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