Abililty to minimise Preview result window
When you develop an expression it is very useful to use the preview function. Quite often you can discover and debug directly from this, but you are not abel to close down the window and check the code!
So either you memorise or you export the csv file ... which is quite cumbersom.
I suggest that you are allowed to minimse the preview window to revise your code so you can easily crosschek your findings. This small change would speed up development .