En Plasma hay distintos lanzadores de aplicaciones o "menús de inicio", entre los que se incluyen:
How to change the application launcher
To change the application launcher, right click on your current launcher and select
Next, choose the launcher you want to use.
How do I change which key opens the application launcher?
It's possible to do that in two ways: you may right click on your current launcher and select, selecting the tab , clicking on the button and then typing the combination you want to use as keyboard shortcut.
You can also use→ → → → .
And if you ever want to restore the default Meta key, you can use the combination Alt+F1, which serves this exact purpose.
I can't bind the Meta key to open the Application Launcher anymore!
This issue may occur because of the way KWin binds keys. Please refer to this section.