it is fine on the article page now but not good on others such as contacts and menus

That's cause it's using width: auto rather than a set width. Only way around this is to use an inline form which is not a good approach at all, or stick with the old (set width) method

its also caused because alias has been moved to the new line

Moving to a new line was to improve UX. Inline forms are bad practice.

I could set the min-width to 100px instead of 50px.

Is it really an online form?

oops auto correct - that should have course been inline not online

Yes, it's still inline

Is it really bad UX when you only have two fields - i am not convinced

If you had a blank page with just 2 field, then probably not. But seeing as this is a compact admin interface, then yes.

We might have to agree to disagree on that

Serious question: What is the reason (explanation) why inline forms are bad practice / UX?
And do those reasons really apply to that subset of our form?
To me it sounds more like a generalised statement (and generalised statements are usually wrong).

@Bakual - cause stacked forms are easier to scan that inline ones. Even more so in this case as the Title input is much longer than a normal input.

closing, someone else can do this