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This is a a very popular question. Rule of thumb is to double-space everything.

Double-Spacing

Double space throughout.This includes all text in your manuscript, titles, headings, references, quotations (under and over 40 words), and figure captions.

Single-Spacing

Never use single-spacing, or one-and-a-half spacing except in tables, or figures.

Triple and Quadruple-Spacing

Triple and quadruple spacing is acceptable in special circumstances.

Footnotes

If you do use them, leave then as they are with the default setting of your word-processing program.

(American Psychological Association, 2020, pp. 45, 171, 229)