WebStorm IDE appearance doesn't change

Hello,
I have installed WebStorm in a Windows 7 64-bits. When I'm going to File-> Settings > Appearance & Behavior > Appearance > Theme, find only three themes: Darcula, IntelliJ and Windows.
I'm trying to change WebStorm IDE Darcula theme, which is too dark for my sight, and have downloaded several themes from www.color-themes.com and imported them through "Import Settings" option, but I could only change the EDITOR background and font color, not the IDE theme. The attached picture is my final result. How to change IDE background theme?
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as far as I can see, you are NOT using Darcula theme. you are using Material UI theme provided by Material Theme UI plugin (https://plugins.jetbrains.com/plugin/8006-material-theme-ui).
To be able to switch UI themes in Settings > Appearance & Behavior > Appearance > Theme, you need disabling this plugin in Settings > Plugins first
>have downloaded several themes from www.color-themes.com and imported them through "Import Settings" option, but I could only change the EDITOR background and font color, not the IDE theme.
Themes available at http://www.color-themes.com/ are editor color schemes and, as such, can only be applied to editor; once you install them, you can select the downloaded scheme in Settings > Editor > Color Scheme, as it's written in http://www.color-themes.com/?view=help
UI themes, available at Settings > Appearance & Behavior > Appearance > Theme are Java Look&Feels. This is a standard way to style Swing applications. as such, they are written in java and distributed as plugins, like Material UI theme
Thanks a lot! I didn't know about that.