Magento 2 - How to reset XML block arguments such as CSS

Question

I'm wondering how to unset CSS that has been set through the XML, for example:

<block class="Magento\Framework\View\Element\Template" name="navigation.sections" before="-" template="Magento_Theme::html/sections.phtml">
 <arguments>
 <argument name="group_name" xsi:type="string">navigation-sections</argument>
 <argument name="group_css" xsi:type="string">nav-sections</argument>
 </arguments>
</block>

That code is from the Magento Theme module. I would like to remove the group_css argument in my own theme, I do not want .nav-sections to be added to by markup.

Answer 1

What about using the magic setter ?

<referenceBlock name="navigation.sections">
 <action method="setGroupCss">
 <argument name="group_css" xsi:type="string"></argument>
 </action>
</referenceBlock>

Or even better, I'm pretty sure you can use :

<referenceBlock name="navigation.sections">
 <action method="unsGroupCss" />
</referenceBlock>

Alternative without using the action tag:

<referenceBlock name="navigation.sections">
 <arguments>
 <argument name="group_css" xsi:type="string"></argument>
 </arguments>
</referenceBlock>

• Ben Crook: Hmmm I used a modified version of your first version, I remember reading that we shouldn't use action if the same result can be achieved through arguments. So I replaced your action method with arguments and it worked a treat, thank you.
• Raphael at Digital Pianism: @Ben-Space48 yeah good point I think the action tag is going to be deprecated at some point, I've updated my answer to reflect what you pointed out
• bhargav shastri: perfect i am able to add new column with above code thanks, but any idea how to remove existing column with xml file?

Answer 2

I use without action tag:

<referenceBlock name="navigation.sections">
 <arguments>
 <argument name="group_css" xsi:type="string"/>
 </arguments>
</referenceBlock>