I was glad you changed the user interface, but I can’t find a way to change the width or height as in the old version of the interface. Are these features disabled in the new version of the interface?
Old version
New version
Correct! 
This is just one of the many issues/bug/questions I raised in this post Drag And Drop Running List of Issues and Bugs
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Most likely, these properties will be added in a later version (hopefully), as this is still a beta test.
Disable new test features to revert to the old version.