Online Library Interfaces: A User-Centered Study on Design and Functionality Preferences of Gen-Z Users

University libraries, in the era of digitalization, have become essential platforms for obtaining academic information. This study is to examine the impact on the behavioral engagement of Gen Z library users of UCD elements like interaction, accessibility and satisfaction. Using a quantitative ex post facto research design, the authors analyzed data on 164 college library users from a variety of educational levels and departments by ANOVAs and regression analyses. The findings were that interaction (β=0.612,p<0.001) and accessibility (β=0.822,p<0.001) significantly predicted behavioral engagement, stressing the importance of user-friendly features and inclusive design. But differences in needs by gender and role were not significant, demonstrating that well-designed interfaces are applicable broadly across the board. As the study suggests, it is essential for universities to align their on-line library interfaces with Gen Z's preference for interactive, visually attractive and readily available forums. Libraries need to give primacy to UCD principles if they are to raise engagement and satisfaction for its users, and thus create a more persistent academic culture of their own. The research adds to literature about digital library usage and offers valuable insights for developing online systems.