Unfortunately, drop down menus for selecting options in PVA are not supported at this time. However, you are welcome to create an Idea for it! Ideas are community-provided suggestions to the Power Virtual Agents team, and are a great way for users to show the sorts of features they'd want to use in the future! Here's the link to the Power Virtual Agents Idea forum: https://powerusers.microsoft.com/t5/Power-Virtual-Agents-Ideas/idb-p/pva_ideas
Thank you for using Microsoft Power Platform Communities! Bryn Baker Support Engineer Microsoft Power Platform If this post helps, then please consider accepting it as the solution to help other members find it more quickly! Have a great day!