My name is*****'m a certified computer professional with 15 years of experience. It would be my pleasure to assist you with this. This happens when the device can't successfully boot up to the Home screen. The Factory Mode is automatically enabled if some data or files in the EFS folder are missing or if the partition itself is corrupted. There are also times when the either the firmware or the hardware glitches that the phone will boot up into this state.
I would recommend either taking it in (if you need to try to recover data from it) or performing a factory reset.
You can try to boot it in safe mode and back up all your data in preparation for a master reset that will bring everything back to factory defaults. Booting in safe mode will also give you an idea if the phone can still boot in other modes.
If the phone successfully booted in safe mode, backup all your data, files, pictures, videos, etc. and then turn it off and remove both the SIM card and microSD card.
If these procedures failed, it’s time to contact Samsung.
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Good morning Christopher. I am following up with you to find out where things stand with your Galaxy S6. Were you able to do a master reset by following the instructions that I provided? If so, please kindly take a moment to rate my service. You can provide a rating by clicking on the stars and then clicking on submit. Please remember, don't rate until you are satisfied. If you need more help, please allow me to continue to work with you or allow me to "opt-out" so that other experts can assist you. Your complete satisfaction is my goal! Thank you!