Description meta length is so short

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Here is how to change the SEO Meta Description with the help of Rank Math:
Add a Meta Description in Classic Editor:

Add title and description in Gutenberg:

Please note Search engines like Google normally truncate the description to 155 – 160 characters. You can read more about it here: https://moz.com/learn/seo/meta-description

Hope that helps. If you have any further question(s), please let us know. Thank you.