I have a feeling that the solution for this would have to be a way to “zoom in” pages instead of just resizing the whole Obsidian MD window. I have encountered similar issues with viewing images. It’s really just difficult to view or zoom into images in Obsidian as well. Opening them in external viewer’s the only option.
Although with this kind of use case, a zoom functionality’s really the only way. As well as allowing for “full width” on pages. So might as well apply it to the rest of the use cases.