Plasma/Application Dashboard
What is Application Dashboard?
Application Dashboard is an alternative launcher which fills the whole desktop. This is advantageous for smaller screens or if you work with touch screens.
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First released with Plasma 5.4 it is an entirely new fullscreen launcher: Featuring all features of Application Menu it includes sophisticated scaling to screen size and full spatial keyboard navigation. The new launcher allows you to easily and quickly find applications, as well as recently used or favorited documents and contacts based on your previous activity.
At the very top of the screen you can switch between the Apps & Documents view and the widget view. At the widget view you have an overview of you widgets sorted by categories.
The Apps & Documents view lets you look for your apps and last used documents.
In both views the second line is where your search term is shown. To search simply type your search term. There is no need to click on the search line as this is no clickable field anyway. Generally in Application Dashboard clicking somewhere which is not a clickable field will close Application Dashboard. So in any case you are in panic because you don't know how to get out of the application windows, just click on an empty area and you are free!