Hey i have Krita in 4.0.0 version and when i create text box and cant stretch etc. this box. I see a little white squares on the edges (after pick tool edit sharpes) but when i try move it by mouse nothing is happens :/ Why?

It would be a good idea to update to version 4.1.7 which is the latest version of krita. The text tool may have had some changes/fixes since then.