If you enable the vMicro > Compiler > Show Build Properties and perform a build this will show all settings which are merged together to form the bootloader pattern.

If you search the output for "fuse" and "lock" you will see a number of settings:
bootloader.unlock_bits=0x3F
bootloader.lock_bits=0x0F

bootloader.low_fuses=0xFF
menu.cpu.atmega2560.bootloader.high_fuses=0xD8
menu.cpu.atmega2560.bootloader.extended_fuses=0xFD

tools.avrdude.bootloader.pattern="{cmd.path}" "-C{config.path}" {bootloader.verbose} -p{build.mcu} -c{protocol} {program.extra_params} "-Uflash:w:{runtime.platform.path}/bootloaders/{bootloader.file}:i" -Ulock:w:{bootloader.lock_bits}:m


If you add a local board.txt to your project from vMicro > Add Code > Add Local board.txt you can paste in the entries you wish to override, and then perform the action again.

Tip: Enable vMicro > Uploader > Verbose, and try to burn the bootloader with the board disconnected so you can review the final resulting command before performing the burn to your board