We are in the process of upgrading to Joomla 4 and one thing we find is that the User Parameter field that we include in the Contact Info tab of the user profile has disappeared.
It displays on our Joomla Joomla! 3.10.12, but it has not displayed on any of the Joomla 4 versions we have been using (Currently using Joomla 4.4.0)
Settings for the User Parameter field are identical on both sites. The only option that we show in the user profile edit page is the ability to change frontend language.
Joomla 3.10.12
Joomla 4.4.0
We use CB nightly builds on this dev site and it is current as of today.