Update on Overleaf.

leelavati.cls

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+% leelavati.cls — Author class (XeLaTeX, KOMA-Script)
+% (MODULARIZED VERSION)
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{leelavati}[2025/12/08 v1.1 leelavati Author Class (Modular)]
+
+% -------------------------------
+% Engine guard + base class options
+% -------------------------------
+\RequirePackage{iftex}
+\ifXeTeX\else
+  \ClassError{leelavati}{This class requires XeLaTeX}{Use xelatex to compile.}
+\fi
+
+% -------------------------------
+% Core packages (ONLY those needed for the engine/structure)
+% -------------------------------
+
+% Pass any user options through to scrbook
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{scrbook}}
+% Defaults (user options still win) - Uses KOMA-Script paper size format
+\PassOptionsToClass{10pt,twocolumn,oneside,openany,titlepage=false}{scrbook}
+\ProcessOptions\relax
+
+% Load KOMA base class and activate KOMA-native layout
+\LoadClass{scrbook}
+
+\usepackage[paperwidth=18cm, paperheight=24cm, left=1.25cm, right=1.25cm, top=1.7cm, bottom=1.9cm, footskip=30pt]{geometry}
+
+% -------------------------------
+% Load External Definitions (The best practice!)
+% -------------------------------
+\RequirePackage{../leelavati_defs}
+% -------------------------------
+% Hyperref last (essential)
+% -------------------------------
+\RequirePackage[hidelinks]{hyperref}
+
+\makeatletter
+\renewcommand{\maketitle}{%
+  \stepcounter{chapter} % Keep your article numbering consistent
+  
+  \twocolumn[
+    \vspace*{0.0em}     
+    % 1. Typeset the Title using the internal \@title
+    {\centering 
+      \par
+      \setkomafont{title}{\anekfont\color{magHighlight}\Large\sbseries\selectfont} 
+      \usekomafont{title}\@title\par
+      \vspace{0.2cm} 
+    }
+    
+    % 2. Typeset the Author using the internal \@author
+    {\centering
+      \normalsize \@author\par 
+      \vspace{0.2in} 
+    }
+  ]%
+  \phantomsection
+}
+\makeatother
+\endinput