It should be noted that the defense teachers don't read the paper carefully, and they can't find the problems in your paper.
The defense teachers are all battle-hardened and most of them are experts for many years. They have participated in various defense, fund and project reviews, and reviewed more books than you have read since childhood. You can completely read the undergraduate and master's papers in a few minutes. Although it is said that "the defense teacher will not read the content of the paper carefully", if your paper has fundamental mistakes, it is entirely possible to find them in just a few minutes. Therefore, it is necessary to ensure that there are no fatal errors in text, format and logical structure.
Format is the most important, including abstract, table of contents, text, conclusion, references, appendices, thanks, etc. These are indispensable. All fonts, line spacing, header page numbers, etc. It can't be wrong at all. If there are mistakes, there is something wrong with your attitude. The writing is fluent, and there can be no typos. As for the text, the teacher will read it casually during the defense, because the defense is only 15 minutes, so the teacher will follow your speech casually or focus on a paragraph to see if the sentence is smooth and the words are accurate.