The SD on the TAZ 6 is read/written by the Marlin firmware. Between the time it used to give you the newest file first and the time it started putting them in an unknown order did you update the TAZ 6 firmware?
Unfortunately, the sort order isn’t a run time configuration. There are a couple of compile time configuration settings:
// Reverse SD sort to show "more recent" files first, according to the card's FAT.
// Since the FAT gets out of order with usage, SDCARD_SORT_ALPHA is recommended.
#if ENABLED(SDCARD_RATHERRECENTFIRST) && DISABLED(SDCARD_SORT_ALPHA)
If SDCARD_SORT_ALPHA is defined, then the state of SDCARD_RATHERRECENTFIRST doesn’t matter.
Changing the way Windows or MacOS displays the contents of the SD card won’t make any difference on the the TAZ 6. If you copy all the files (and folders) off of the SD card, format it, and write them back it might change the order on the TAZ 6, depending on the compile time firmware options.