How to use tabs for Markdown indentation in IntelliJ 2020.2.1 - intellij-idea

For every file type it is possible to press the button at the end of the bottom bar and change to tabs in the popup but the popup for Markdown does not show an option to use tab character, even though the buttons says "Configure Indents".
How can I use tabs for Markdown without having to do "CTRL+SHIFT+A -> To Tabs" after every time I've finished writing?

Solved in 2020.3 (currently early access).
Issue: https://youtrack.jetbrains.com/issue/IDEA-243531

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P.S. I am talking about changing indication styling of the place in red eclipse in the pic.

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Unfortunately, this is not possible, yet.
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How do I remove the "stripe marks" from navigation bar and project window?

I use a handlebars plugin to be used with requirejs in my project. This makes Webstorm report an error if I require a template using the plugin-specific syntax:
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And what are counterparts to eclipse's declaration view and javadoc view?
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