Flash size

i am using nrf52840 s140 sdk ver 17.1.0  dfu/ secure bootloader/ pca10056_s140ble_debug  example after flashing the code the flash memory is almost full ie 99.6% is the sdk is  taking that much of memory i have tried for dfu/ secure bootloader/ pca10056_s140ble both having the same full flash memory how can we reduce it

NOTE: If the flash size is decreased i will use this application directly for dfu ota with running two application in the flash so whenever required i will switch between main app and dfu app

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