The Codeblock Customizer plugin allows Obsidian users to extensively customize the appearance and functionality of code blocks in their notes. Features include support for custom themes, line and text highlighting with multiple colors, line numbering, and header customization with file names, titles, or icons. The plugin also supports folding and semi-folding of code blocks for better readability and organization. Advanced options such as language-specific coloring, bracket matching, and selection matching enhance the coding experience. Additionally, inline code and links can be styled, and custom SVGs can be integrated. These capabilities make it easy to adapt code blocks to suit personal preferences or specific workflows.