Hey, @pycharm problem with viewing SASS/SCSS variables is still here...
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No problems with mystyles.scss located in the project root. We don't know about the setup of the project on your first screenshot - whether the file is in the project or not, but we reproduced the warning in the case when the file is not part of the project.
Please follow this issue for updates if your _variables.scss file is a non-project file: https://youtrack.jetbrains.com/issue/WEB-30320
I did all of YouTrack issue. Warning doesn't show. Okay, you right... but how to hide this warnings in all of my projects (about 12) with Bulma.io? I use on other PC old @pycharm version 2017.2 and this warning gone... strange solutions, but it's all I have now to solve this! 
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