Update

lisp/init-org.el

@@ -229,7 +229,30 @@ the element after the #+HEADER: tag."
       (remove-hook 'org-latex-preview-overlay-update-functions
                     #'my/org-latex-preview-center)
       (remove-hook 'org-latex-preview-overlay-open-functions
-                    #'my/org-latex-preview-uncenter))))
+                   #'my/org-latex-preview-uncenter)))
+  (defun my/text-scale-adjust-latex-previews ()
+    "Adjust the size of latex preview fragments when changing the buffer's text scale."
+    (pcase major-mode
+      ('latex-mode
+       (dolist (ov (overlays-in (point-min) (point-max)))
+         (if (eq (overlay-get ov 'category)
+                 'preview-overlay)
+             (my/text-scale--resize-fragment ov))))
+      ('org-mode
+       (dolist (ov (overlays-in (point-min) (point-max)))
+         (if (eq (overlay-get ov 'org-overlay-type)
+                 'org-latex-overlay)
+             (my/text-scale--resize-fragment ov))))))
+
+  (defun my/text-scale--resize-fragment (ov)
+    (overlay-put
+     ov 'display
+     (cons 'image
+           (plist-put
+            (cdr (overlay-get ov 'display))
+            :scale (+ 1.0 (* 0.25 text-scale-mode-amount))))))
+
+  (add-hook 'text-scale-mode-hook #'my/text-scale-adjust-latex-previews))
 
 (use-package org-roam
   :ensure t