Hmm, that window title is obviously wrong. I’ll fix that.
We still need to implement right-clicking to edit a table’s relationships from this overview. I’d also like some horizontal lines in the relationship connection lines, where they meet the table rectangles, to more obviously show the indicated key fields. And the arrows need to point both ways when there are relationships in both directions.
Note that 1-to-1, 1-to-many, many-to-many markings are not relevant in Glom, at least for now, because it does not try to enforce these things, though they would be useful extra information for the user to add to the overview.
However, this feature won’t be enabled for the upcoming Glom 1.4, because it depends on GooCanvas which is, quite rightly, taking some more time before it is declared API/ABI stable. This bug report has a patch to enable the feature if you would like to play with the code.