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It's not clear if the OP is referring to self publication or seeking representation. My understanding is the industry standard (when subbing to an agent, for example) is defined. It may vary by a...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/40988 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It's not clear if the OP is referring to self publication or seeking representation. My understanding is the industry standard (when subbing to an agent, for example) is defined. It may vary by agent, but I think industry standard is to place a hash mark (centered) between scenes. Also, I believe chapters start 1/3 way down the page. I believe chapter ends have a page break. I believe the pages are to be numbered, and the header has contact information and manuscript metrics. I believe the text itself should be Times New Roman, 12 point, double spaced. Standard margins (1 inch). These beliefs have been formed by various conversations and googles over the past year but I've not rigorously checked them. But again, the OP was not clear as to what sort of document they are writing, for self-publication, querying/submitting a manuscript, or other.