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]box
Is ON
⎕←{⎕←⍵}(1 2)(3 4)
1 2 3 4
┌───┬───┐
│1 2│3 4│
└───┴───┘
⍝⍝ How to get identical behavior inside and outside a dfn?

Here:

      ]box on -fns=on
Was ON -fns=off
        ⎕←{⎕←⍵}(1 2)(3 4)
┌───┬───┐
│1 2│3 4│
└───┴───┘
┌───┬───┐
│1 2│3 4│
└───┴───┘

-fns=on enables boxing of output within functions, as they are executing.