The words "Retrieved from" are not typically used in APA 7 references. However, there is an exception to this rule.
If the material being used is likely to be changed or updated over time, such as a blog post or wiki page, then the reference requires a Retrieval Date. According to Chapter 9 of the APA 7th Edition Publication Manual, when a Retrieval Date is included, the reference requires the addition of the words "Retrieved from" preceding the URL.
U.S. Census Bureau. (n.d.). U.S. and world population clock. U.S. Department of Commerce. Retrieved January 9, 2020, from https://www.census.gov/popclock/
You can also find this information on the APA Style Blog, the official blog of the APA, under "6. Webpage on a website with a retrieval date" at this link: https://apastyle.apa.org/style-grammar-guidelines/references/examples/webpage-website-references#6
In order to have PERRLA generate a reference without the words "Retrieved from," do not include a retrieval date when creating the reference.