Sumdesign2020

Site URL: http://sumdesign.co Hi there! I want to keep the feature of the Portfolio which enables a click into a project and several images within the project. However I want this to be displayed similar to the Image block, Gallery - in the "strip" format, which I am currently adopting in the main page of the website, I have screenshot what I have as below. This is still currently an image-gallery, and only opens into a singular image in the lightbox feature. We would want this to be a portfolio instead and opens up into multiple consequent images. Is there a way to customise the portfolio page, so that it displays our images as below? Note that we are on a personal plan, so only Custom CSS is available. No experience in any coding so any help or suggestions would be greatly appreciated. Thanks in advance!