Unable to type in the Laucher search bar and to rename folders/files on desktop

Hi all I’m a total fresh newbie of KDE (5.24.7), installed on Zorin 17.3 Core 6 days ago, becoming the primary DE because the great amount of difficulties with Gnome (untouched, just abandoned somewhere under the rug).
I have a problem can’t fix on myself, probably I did a bad adjust or unset some settings… all work extremely fine but since the first DE starting i was unable to rename folders or files directly on desktop (right click on the file; click on Rename) the text name become higlighted but no input from the keyboard! I can press hundred of buttons and randomly one or two will be placed… Renaming via Dolphin all go well as usual no troubles!
Same kind of trouble trying to type in the search bar allowed in the top right of the App Laucher: no way to type there but Krunner (Alt+Space) work fine.
What I need to change or set? where?
THX
Angelo.
P.S. If you need to have a better vision I upped on Mediafire a little Kazam videocapture about what I wrote

Ok dunno why but I think (hope) I’ve fix it… Scene: yesterday evening i start another little trouble changing the boot login theme: installed Infinity but it didn’t work and Kde ask about Main.qml:Libraries import requires a version. Surfing on the forums I found the solution installing the QT framework 5 (this pack: qml-module-qtserviceframework). Restarting the PC the boot theme work fine and surprise: I can write in the Kickoff search bar and can change/modify the names of folders and files on Desktop without open Dolphin. It was only a case or really the Qt framework restored the search bar???

Hi! Hopefully all is working ok for you now :slight_smile: Just for reference, some context on using that version of Zorin OS with Plasma might be helpful: