You'd need to move to 7.4. The properties of each gadget is set by default to autosize but there is also a property to turn that off and manually size
Sorry, forgot to mention that we're already on 7.4
Where do I find the manual sizing properties for the panels?
As far as I know you can't set heights in Console.
But in WebDesk you can click on the small Down arror at the top right of each gadget and select Properties > Determine Height Automatically.
Cheers - Adam.