It is tedious to extend the height and width of the class shape areas after added new fields or methods to the class representation.
Googling suggests ctrl-shft-y, / Arrange -> Autosize, but this does not appear to work as expected for "Class" shapes. (It works fine on a regular rectangle).
Has anyone found a good way to add extra fields without manual overhead?
On
When text is written only in one line, (when a new row is added) try to select only that row (not the whole UML shape) and go to Arrange > Autosize or press Ctrl+Shift+y It should work well.
When the new row is added, but the text is written in 2 or more lines, please tick a "Formatted text" in Text tab (Format panel) and then go to Arrange > Autosize or press Ctrl+Shift+y
It should increase the hight of the row.
If you have a problem with this, please vote for a Trello feature card I opened here: https://trello.com/c/NSIxt85Y/424-support-autosize-for-uml-when-new-row-is-added-with-multi-line-text-change-height-correctly cause there is a possibility that this feature should be improved.
I didn't understand list shapes in Draw.io.
It's explained here https://desk.draw.io/support/solutions/articles/16000054082-adding-entries-in-uml-diagrams
Ctrl-Enter to 'add a new line' (clone a shape in the list) and enter to edit/rename that shape.