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HI Hannah,
I am not expert enough with line numbers and bullet points to conclusively answer your question, but I can tell you with confidence that Sola's advice is not good.
There is a difference between line numbers, bullet points and numbered bullet points. When you turn line numbers on, you will see line numbers in the left margin. When making bullet points you can choose either bullets or numbers which are usually formatted to be within the body, often indented.
Sola assumed you were talking about bullets and numbers, but there is a feature called line number which you referred to. If you can clarify which numbering feature is involved, that would be helpful in helping you resolve this.