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Simplify user interface
Hide non-essential user interface elements:
- the startup message in the echo area
- the “Emacs Calculator Mode” banner on top of the stack
- the all-inputs “trail” window.
(with-eval-after-load 'calc
(setopt calc-inhibit-startup-message t)
;; NOTE Not `custom'-settable.
;; For many variables, Calc uses `defcalcmodevar' instead of `defcustom'.
(setq calc-show-banner t
calc-display-trail t))