I've seen it existing forever and also never understood what it was or how it's supposed to be used.
KDE
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Plasmoids are the widgets that you put on your task bar in KDE.
The Grouping Plasmoid lets you group multiple widgets together on the task bar.
To add one you right click on the task bar and click on the "Add Widget" button. Then find the Grouping Plasmoid and drag it to your bar.
This is not limited to taskbar as shown here https://lemmy.world/comment/11769386
The dragging and dropping is for adding fresh widgets using Add Widget and not to drag ones that are already on the desktop.
"task bar" is the magic word I needed. Thanks.
Context, screenshots etc?
Never heard of that
Here is a screenshot I took after I managed to figure it out. It seems I cannot use it in a tiled fashion though so at a time only one can be in focus.