Ctrl-Shift-F doesn't work in CLion in KDE

Question

Ctrl-Shift-F (find in files) doesn't work in CLion in KDE. How to fix?

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$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:        18.04
Codename:       bionic