If you go to the official Apache Friends download page, you will likely find XAMPP with PHP 7.4 listed primarily as a 64-bit application. You will find XAMPP with PHP 7.2 or 7.3 in 32-bit, but 7.4 32-bit versions are "unicorns"—rare and hard to locate on the main page.
Edit C:\xampp\php\php.ini :
This article explores the relevance, setup, and considerations of using this specific version of the popular Apache distribution. xampp 32 bits php 7.4