Hover over a widget, then click and drag one of the eight points to resize to your desired width and height.
Resizing grouped widgets
You can change the sizes of individual widgets in a group to provide a clear visual hierarchy. Click on a group to activate it, then hover between two widgets before clicking and dragging the slider to resize the widget. The other widgets in the group will respond to this new size.
Grouped widgets can be arranged side by side or stacked. Click the icon in the top right corner to open the group settings.