Item Stack Sizes & 1080p Client

Does anyone know how to edit Item Stack sizes? I changes iteminfo.snh but that doesnt lock it in. Does it need to be changed somehere in the client as well?

Also curious if anyone knows how to make the client 1920x1080 on windows 10 does not give me any options to go higher resolution.

Depends on the client some have come up with a solution for Odin Files

I managed to resolve the max item stack. Can only seem to get a stack of 250 before it gets messed up. Running Odin files, resolution issues is annoying af