Have you tried Cario-Dock? Its not a native KDE app, but it does support KDE integration. I installed it on KDE Neon after the Latte Dock announcement. No crashes, and it has a lot of features. Source: over 1 year ago

If you like Macs, the dock program Cairo-Dock has a bunch of built in themes, including one to look like the OSX style dock with the cool reflections: https://glx-dock.org. Source: over 1 year ago

The closest thing you can do this is with cairo dock. It take some time, to customize it to make it look like what you see in the picture. It was a trend a decade ago, but not sure how much the package is maintained right now. For alternative you can check out docky which works pretty well with Gnome and its cousins, and if you are using KDE I better advice you to stick with latte dock. Source: over 2 years ago

The least annoying solution I found was installing 3RVX which looks like the original Mac OS volume display and works with the keyboard's volume keys. https://3rvx.com/. Source: about 1 year ago

That sounds like you are missing some Lenovo drivers that enable the Volume Keys. As for look and feel, try 3RVX: https://3rvx.com. Source: about 3 years ago

If your computer can run Windows 7, it can also run Windows 10 unless you have less than 1 GB of RAM or there are incompatible drivers. Otherwise try 3RVX for a volume on-screen display. Source: about 3 years ago