loukasgr As per feedback by JA Dev. Team, The specific JS functionality is triggered by Owl carousel however JA Resume is using Owl carousel v1 since being older template in comparison with JA Fit wheras, JA Fit is using Owl carousel v2
-- Owl carousel v2 has the functionality to trigger width value based upon responsive screen sizes to adapt image to get the right size as per available space however Owl carousel v1 doesnt have this relative functionality
Conclusively, Sorry but I am afraid that this would require custom work alongwith Javascript knowledge to get Owl carousel v2 working and integrated with JA resume and thereafter getting the results as envisaged henceforth, would suggest to kindly hire developer or agency for the same