Recover full space on MicroSD card [SOLVED]

Q. Can you please help me recover the space on one of my microsdxc cards? I installed a custom OS on one with an sd formatter and now it only shows like 1/16th of it’s full size 🙁 I have tried the SD card on my laptop, my Android phone and my tablet. They ALL show the smaller size and don’t allow me to format the full size! Would like to do the recovery on Windows if possible. Thx!!! -Sam Staffton