I’ve mentioned it before and will mention it again. The new relationship can be disastrous for certain workflows, especially on smaller screens where low display resolutions are still common.
Here is an example of how fast and straightforward e.g. changing the direction of a relationship used to be (using Tab ↹):
And this is how it would look like with the new relationship editor:
Since tabbing is no longer viable one would have to use the cursor:
It’s easier to misclick, the layout is shifting and requires considerably more space. On a small screen with a low resolution it might not even fit the viewport. (Not to mention the space needed when help text is displayed)
As you can also see when tabbing through the dialog it will automatically select some attributes.
How about utilizing more of the available horizontal space, e.g. putting attributes to the right?
Attributes are optional so it might make sense to not place them where they are “in the way”.