Shut down FFXI, download the file below, extract the d3d8.dll and d3d8.ini files out of it and drop them in your ffxi-bootmod folder next to boot.exe (in your Ashita folder, where you put that - probably "C:\Program Files (x86)\NasomiXI\SquareEnix\Ashita\ffxi-bootmod" by default iirc.. I pointed my install elsewhere).
File:
https://forums.ashitaxi.com/download/fi ... 6b6ee31001Forum link, if you'd rather read and click the link yourself:
https://forums.ashitaxi.com/viewtopic.php?t=855If you get weird shadow effects (you probably will, I do on my GTX 1650), you'll want to open that d3d8.ini file in Notepad or something and go all the way down to the bottom and change the "0" to a "1" here:
[Fix_ShadowZFighting]
enabled = 0
change to:
[Fix_ShadowZFighting]
enabled = 1
Then restart FFXI again. You'll only have to do all of the above once.