This build caps the size of the render targets to 4096 so that you shouldn't get crashes in multimonitor windowed scenarios with horizontal or vertical resolutions up to 5120.
Now, there's a gotcha here in that if either resolution goes over 4096, you likely aren't going to get colored lighting. Render targets are one of the most memory intensive parts of the new Terraria update, and there's just not a ton of room left to work in their 32-bit address space.
I know that tModLoader has an experimental 64-bit version in the works that will eliminate these memory constraints, but please be aware that I'm almost at the limit of what I can do resolution-wise here.
I'm not charging in Patreon for these intermediate builds, but if things are looking good on 5/30, I'll post a charge post at that time with the source for this build.
Finally, I'm not going to be available from May 22 through May 25. I'm taking my granddaughter and her fiancee out for a hiking trip to get out of the house.