But also, it isn’t available for readers of blogs or in the dashboard, so it often switches back to bright white once posting, or going back to edit the blog settings.
I rely on a generic reader but that also often has different compatibility issues.
Any improvements or tips on where I might be going wrong are appreciated.
yeah it is only that page, the text entry page, that gives you that option.
I am not sure where Matt is at with the project/roadmap these days, but I used to have a paid write.as account, then moved away to hugo, and more moved back to writefreely. Me using a foss version and not paying Matt certainly makes me want to be less demanding of his time, but I can deal with the white back-end pages, when my actual blog itself allows css themes.