It seems that sometime after 5.4.3, the space that surrounds a metric visualization increased very much.
We went to 5.5.2 that saw this issue of a default interval (0,0) always there and that the visualization
did not fit its original space. In 5.6.1 the default interval presentation is a bit different and we do not see the interval switch handle, but still simple aggreagation of two numbers takes a lot of space - notice the added scrollbar on the dashboard. (bootstrap and accessability gone too far ?-).