On Joomla 4 sites, I've gone into Plugins: System - Regular Labs Library and set "Combine Admin Menu" to Yes to replicate the setting I had on Joomla 3 sites.
At the moment with that setting set to Yes in Joomla 4, the Components menu still shows the individual Regular Labs components listed individually instead of combined.
Finding the same issue across all J4 sites I've tried it on.