Archive post in tonal

I have set up a archive page for my portfoilo projects.
The only problem is It is only possible to view it when you scroll through. You cannot select different projects. The latest project is the first and you have to scroll down through each project to see the next.
Can I create a gallery page or thumbnail list for the projects so the viewer can click the one they want to view?
This archive project list is set to primary menu in tonal theme.
Whats the best way to see the portfolio posts as a gallery?
Many thanks in advance!

The page I need help with: [log in to see the link]