The link above will get you started with the SEAS undergraduate thesis portfolios have been submitted online through Libra, the UVA LIbrary's digital repository, since 2020.
From there, you can keyword search or use the toolbar on the left-hand side of the page to limit by advisor (under Author) or by Subject.
This link will get you started with the results of the Library's entire collection of SEAS undergraduate theses. The list is sorted from newest (2019) to oldest. All print portfolios are storage at Ivy Stacks and can be accessed via request. If you've never requested something from Ivy before this guide will walk you through how to do it.