I forgot to mention that I was recently dabbling around with the latest beta of Audacity, the free audio editing app for Windows, MacOS, Linux. The UI received a huge update and is really nice to use. I only had one or two issues with the beta, but it worked pretty well overall. I think it's a nice improvement over the previous version. I was using it on Fedora 44 KDE Plasma Linux on my Lenovo ThinkPad (I use a Win11 icon theme - ironic, I know).
https://github.com/audacity/audacity/releases/tag/Audacity-4.0.0-beta-2