How to resize images proportionally(keeping the aspect ratio) with composer gui?

Beta Testing Composer GUI Beta Testing
#1

Hi,
yesterday I tried to resize some images with composer gui but I was not satisfied with the result. Is there a way to resize images with composer gui by keeping the aspect ratio? Please help me.

#2

I found the answer: 
Press the shift key while dragging to resize your image proportionally

#3

I found the answer: 
Press the shift key while dragging to resize your image proportionally