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Are you referring to line spacing of blockquote text? If yes, add class property on the blockquote and then use the following CSS by adding on Appearance > Customize > Custom > Edit Global CSS:
This is how we define the class on shortcode: [blockquote cite="Mr. WordPress" type="left" class="custom-bq"]It was the most amazing WordPress theme I had ever seen. Such beauty. Such grace. Such elegance. She was everything I never knew I wanted and so much more. My beloved X will be with me always.[/blockquote]