After the release of Joomla 4, a lot of people complain about too much to require 12 character passwords upon the installation.
It is great for enhancing the security of your Joomla 4 website, however if you don't like it you can completely adjust the minimum limit for the number of characters in the user password in the user preferences.
Your website administration is fully customizable adjust minimum characters of user password in Joomla 4 through admin page.
Step 1. Access Home Dashboard with Super Administrator account
So that it can be adjusted minimum characters of user password in Joomla 4 you need login Administrator page with super administrator account. Then click Users Icons to go to users manager, then click Options button (top right corner) to access Users Options
Step 2. Adjust minimum characters
At here (Users Options) please click Password Options tab > then scroll Minimum Characters option. Now please adjust minimum characters of user password in Joomla 4 >Save
Step 3. Check result in front-end
After completing the above steps you can check if it is working properly by testing the user registration interface.