Workaround works! In fact, if you set a divider to some smaller width (e.g., 40%) in the “Content” tab, and then to 100% in the “Style” tab > “Layout”, then it’ll expand to the 40% you set in “Content”. Neat!
I think the problem is, the Divider element consisted two nested div. All settings in content applies to the div.line. Div in previous Bricks version has a default 100% width, which is removed in 1.5. So the parent div also lost the 100% width elements.