In settings>appearance you can get more themes. And when scrolling through them the screen will abruptly splash and show the getting more themes loading screen. This is extremely jarring from a UX standpoint. Instead a simple load more/show more button can be added to the bottom of page to allow users to load more themes themselves. This prepares the user for a loading screen and feels much better.
The abrupt loading is gone in Plasma 6 
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