How can I implement this layout?

Hi, I want something that seems fairly simple but I can’t manage to find how to do it. I need to have widgets A and B in a vertical splitter, with the following constraints: A has a variable height but constrained between 30px and 150px B is expanding in all directions without limit I want A to have its minimal (30px) size when the application starts. The user is then free to change it using the splitter. I have set A’s verticalpolicy to Minimum, and B’s vertical policy to Expanding. I have set A’s minimum height to 30 and maximum height to 150px. (If it matters, I’m doing this through the GUI in QtCreator). I have not set any size constraints on B. What happens is that A always reaches its maximum (150px) size on application startup. Here is how it looks like (A is the QTextEdit at the top, B is the QTableView at the bottom): The maximum and minimum allowed sizes of A are well enforced, but I can’t figure out how to make A start with its minimum height and not the maximum. Any idea? Thanks in advance!