Hey, I've always used JCE as my Joomla editor, in my prior Joomla 2.5 and 3 sites. I am now switching everything over to Joomla 4. I see that JCE Pro is still installed (the most current version) within the components installed in my newly migrated Joomla 4 sites. However, it does not show up in the selector dropdown as an option to select. I only see "None," "CodeMirror," and "Tiny MCE" as options for selection. This is both the case in Global Configuration, and also in the specific editor settings for each User.

How can I get Joomla 4 to recognize JCE, and present this as an option to use as my editor?

Looks like I found my own answer here - posting it for the benefit of others:

1) Joomla 4 dashboard prompted me that I needed to enter the Download key for JCE (apparently this didn't transfer over from the Joomla 3 site.)
2) Found the Subscription key in My Account in JCE - pasted it in as the Download key in Joomla 4.
3) Checked Joomla 4 Extensions, searching "JCE." Found 7 JCE plugins - all but 2 were disabled. Enabled all 7 of them.
4) Then went back to Global Configuration - finally JCE appeared in the editor selector dropdown. Selected it - and JCE is working on my sites again!

Hope that's helpful for others that might encounter the same disruption of JCE, in transferring to Joomla 4.

PS: This article (the Joomla 4.x section) was useful in figuring this out:
https://www.joomlacontenteditor.net/support/faq/subscription/using-the-subscription-key

Yes - I learned yesterday that the migration extension I used disables extensions intentionally, and tells you to re-enable them after migration. So yes - this was the correct process.

In the meantime - not having access to JCE for a few days reminded me how much I love and rely on JCE - a mainstay I've used for many years. Grateful to be able to keep using this wonderful program in Joomla 4 now! :-)