When I use array constants on the block diagram I often expand them to show how many elements they contain - I even expand them one element further than their contents to leave no doubt that no elements are hiding below the lowest visible element:
Often it's not so important to know how many elements are in the arrays, nor even their values (one can always scroll through the array if one needs to know). But it can be very important to not get a false impression of a fewer number of elements than is actually present, for instance when auto-indexing a For-loop:
To be able to shrink array constants to a minimum size while still signalling that they contain more elements than currently visible, it would be nice with an indicator on the array constant when it's shrunk to hide elements (here shown with a tooltip that would appear if you hover on the "more elements" dots):
The information in the tooltip would be better placed in context help, but the important aspect of this idea is the "more elements" indicator itself.