Cant add icon in main menu for app

Hi everyone!
I have a problem with adding icon to Webstorm. I added it in main menu then I choose the png for it, but it not works. The app is running perfectly but I cant apply icon. Can you help with that?
Latest Manjaro + Gnome.

It all depends on how you installed webstorm.

If you used the Jetbrains recommended approach (the toolbox app) the shortcut is placed in ~/.local/share/applications - so you can change the icon in the desktop file.

If installed using pacman - copy the shortcut from the system location /usr/share/applications into your local as mentioned above and edit it there.