I make changes to my styles, like line thickness, text size, table line thickness. But it keeps on reverting back to how it was before, whenever i start a new drawing.
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Are you making the changes in your draft template file then saving it? If not that's what you need to do.
styles are stored in every document, they are not global. If you want to use your custom styles in every document you have to change style in your template and save it as @bshand said. To manage styles between documents you can use Style Organizer.