New features of CC 2021 were released in October 2020 and early 2021.
You can now easily add rules between columns right in the Text Frame Options dialog box
I’ve been using the new features of CC 2020 since late in 2019, when they were released.
You can now import PDF comments directly from a reviewed PDF that will apply those changes to the document
You can now adjust page size and margins and InDesign will automatically adjust page content
Workspaces are saved, preset arrangements of panels in Adobe programs. This short video explains how to switch between them, customize them, then save your own.
I’ve been using the new features of CC 2019 since late last year, when they were released.
InDesign CC 2019 includes an amazing new way of fitting content in graphic frames