Changing an element's size in a diagram
Re-sizing
an element
To change the size of an element in a diagram, simply select one of the
control points surrounding the element and drag it to the required size.

Re-sizing a
class
If an element contained within another element is resized, the container
element is also automatically resized.

Re-sizing a
class within a parent class
As you can see, if "ClassB" is expanded, then the size
of "ClassA" is automatically adjusted to accommodate the size
of "ClassB".
Note: The size of the parent element cannot be made narrower or
shorter if this leads to the compression of the space between the elements it
contains.
The
"Fit to content" command
The "Fit to content" command in the context menu on a
diagram element is used to adjust the size of the selected element to the size
of its properties: name, attributes, operations, elements contained inside it,
and so on.

Using the
"Fit to content" command
Steps:
1. Right-click on the element whose size you are going to adjust to open the context menu.
2. Run the "Fit to content" command.
3. The size of the class has been adjusted to its contents.