The appropriate use of headers and subheaders significantly enhances the structure and readability of a TOK essay. They serve as signposts, guiding readers through the essay's various sections and arguments. Effective headers and subheaders provide a clear outline of the essay's structure, enabling readers to anticipate the content of each section. This hierarchical organisation helps in logically segmenting the essay, making it easier for readers to process and understand the information. Moreover, well-thought-out headers and subheaders can capture the essence of each section, making the essay more engaging and easier to navigate, especially for readers seeking specific information.

Font choice plays a significant role in the overall presentation and readability of a TOK essay. The ideal font should be legible, professional, and conducive to prolonged reading. Standard fonts like Times New Roman or Arial are often recommended due to their clarity and ubiquity in academic writing. These fonts are easily readable, which is essential for evaluators who read numerous essays. Exotic or overly stylised fonts can distract from the content and appear unprofessional. The key is to choose a font that complements the serious and scholarly tone of the essay, ensuring that the focus remains on the arguments and insights presented.

Maintaining a consistent margin size throughout a TOK essay is crucial for several reasons. Consistent margins contribute to the neatness and professional appearance of the essay. They provide a clear, uncluttered frame for the text, making it more readable and visually appealing. Standard margin sizes, typically 1 inch (2.54 cm) on all sides, are recommended. This size offers a balance between text space and white space, ensuring the page is not overcrowded while also not appearing sparse. Uniform margins also facilitate easier handling and annotation of the essay by examiners. Inconsistencies in margin sizes can make an essay appear disorganised and may distract from the content.

The alignment of text and paragraphs is significant in impacting the readability of a TOK essay. Proper alignment, typically justified or left-aligned, ensures a clean and orderly appearance, making the text easier to follow. Consistent paragraph indentations contribute to this neatness, clearly demarcating where one point ends and another begins. This structure aids in maintaining the flow of the essay, preventing reader fatigue. Random or inconsistent alignment can disrupt this flow, making the essay appear disorganised and potentially confusing the reader. A well-aligned essay indicates professionalism and attention to detail, reflecting the seriousness of academic work.

The use of colour in a TOK essay can be effective if applied judiciously. Colour can draw attention to key areas, differentiate between themes, or highlight important data in visuals such as charts or graphs. However, it's crucial to use colour sparingly and strategically. Overuse can make the essay appear unprofessional and distract from the content. When using colour, consider its purpose and ensure it adds clarity or emphasis to your argument without overshadowing the written content. Also, be mindful of accessibility; overly vibrant colours or poor colour contrasts can make text difficult to read for some readers.