If you're using KDE Plasma on Fedora Linux and you've noticed that the volume control is missing, don't worry. Here's a simple fix.
Make sure the following Fedora package is installed:
sudo dnf install plasma-pa
This command installs the `plasma-pa` package, which is necessary for volume control functionality in KDE Plasma on Fedora Linux.
After installing this package, you should see the volume control in your system settings. If it's still not there, try rebooting your system.