https://galaxystore.samsung.com/detail/com.luma_touch.lumafusion
Edit: Now available on Play Store https://play.google.com/store/apps/details?id=com.luma_touch.lumafusion
$20 USD or $27 CAD one-time purchase.
I purchased it immediately. Can’t wait to try it. Even at first glance it’s the most feature-complete video editor on Android by a long, long way.
For reference, here is the interface on my Fold’s inner display: https://i.imgur.com/YKRt7Qn.jpg
I have yet to try running it in DeX.