The checkbox 'Resize Content' will scale all objects within the selected block accordingly as the block size changes. For example, if the infographic block size is reduced, all object will shrink accordingly. Changing each object’s size separately will not be needed, hence saving previous time!
If 'Resize Content' is unticked, any changes made on the selected block size will only affect the block, and all objects remains untouched. Note that the width changes will take place from the right side of the block!