We’re considering integration of that same restore fix into the Easy FancyBox plugin. Until then, I recommend installing and activating https://wordpress.org/plugins/restore-image-title/ There are no options to be set, it simply works. If not, please let me know.
Hi William, looking at the source code of your example there, I find no alt or title attributes for either the link or the thumbnail image tag. FancyBox cannot know what to show as title without at least one of those…
Does the theme’s post editor (I suspect it’s one of the pagebuilder type editors?) show as options when inserting such a thumbnail image? Does it allow you to specify a Title or Alt text?
If so, please fill out the same text there as the Caption or another or longer text that you would like to see as title in the light box frame.