(setq org-latex-compiler "lualatex"
      org-latex-preview-auto-generate 'live
      org-latex-preview-persist nil
      org-latex-preview-processing-indicator 'fringe
      org-latex-preview-numbered t
      org-latex-preview-width 0.75
      org-latex-preview-use-precompilation nil
      ;; org-latex-preview-live-display-type 'eldoc
      org-startup-with-latex-preview t
      org-latex-preview-auto-generate t)

(setq org-latex-preview-preamble
      "\\documentclass{article}
\\usepackage{amsmath}
\\usepackage{amssymb}
\\usepackage{amsfonts}
[DEFAULT-PACKAGES]
[PACKAGES]
\\usepackage{xcolor}")

;; \\usepackage{polyglossia}  
;; \\setmainlanguage{greek}   
;; \\setotherlanguage{english}

(plist-put org-format-latex-options :zoom 1.2) ; Calibrated based on the TeX font and org-buffer font.

(add-hook 'org-mode-hook #'org-latex-preview-auto-mode)