Looks like you do not want specific items in the toolbox, and want to remove the color category.
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I assume you mean category (logic, math, etc), not tab (JavaScript, Python, etc). When removing a node from XML (e.g. <category name=colour>) don't forget to remove the node's close tag too (e.g. </category>).
Send (awkwardly) from an Android phone.
I managed to remove blocks but i couldnt remove tabs. When i attempted to remove colour tab from xml file, other tabs are gone too in browser. How can i do that?