No, this settings can't be changed in default setup. Krunner and Kickoff are designed to display search suggestion after at least 3 letters in input. So, you can't change them because there is not configuration option to do so.

• See this Wikipedia Article about Krunner.




• Also see this documentation in userbase.kde.org which says, krunner requires at least 3 letters to be typed to match for a partial search.

A bug report was filed against this behavior in https://bugs.kde.org, though it's status is still (7-9-2012) unconfirmed, the first response was

As Plasma developers (somehow understandable) won‘t remove the 3 letters restricton, at least make it more obvious that it won‘t search bevore you‘ve entered at least 3 letters

So, it seems KDE developers are not willing to change this behavior. I think the only option is to change it yourself and then re-compile.

^{Note that, both Krunner and Kickoff was designed in this way}