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It's good to set only height or height in Set Dimensions, sometimes only one dimension needs adjustment, but the dialog requires to set both dimensions.
Please provide a little more information. For example, how do you open the dialog?
corrected: height or width I have two elements with different sizes and select both, invoke Edit|Set Dimensions and want to set the same height or the same width without modification second dimension.
What may be better is to have some alignment tools on the toolbar (or even in the context menu). You would want Same Height, and Same Width alignment tools. This would be similar to the form editor toolbar buttons.