Webstorm problem with hot key "find in Path"

Hi, i upgraded webstorm to 2018.1.5 version with toolbox help, but i have problem with 'find in the path' hot key. When I was pressing the 'ctrl + shift + f'  I did not  see the window. After this I pressed 'alt + tab' and saw that the window is above my toolbox window, but nothing happens. I can not use the search window. I do not know what is wrong with me or my system, but if i used 2017.3.5 version of program all was fine.

I use Ubuntu 16.04.4 LTS

webstorm 2018.1.5

Thank you for response.