I edited DugiGuideViewer.lua to enable the objectives side-bar and it seems to work without issues with Elvui. It overwrites Elvui’s own map zoom setting (if enabled), but everything else seems to work fine.
It also seems to work with Leatrix, but only the side-bar background is properly scaled to Leatrix map size, the objectives list/text stays (too) large, albeit still usable.