Why are the old versions of InDesign still showing on my CC? How do I remove them?

Call me crazy, but what about a setting that lets people decide whether or not they want to keep outdated software on the computers. 20G suddently dissapeared on my harddrive which rendered it full. There is no reason at all that someone was letting that happen. And I do not want to actively opt out for keeping old versions. There should be only one checkbox for that.

Uninstall software through your operating system.  To wipe off residual files, use the Adobe Cleaner Tool below.

https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

>> I thought it would update and only have the newest version available.

That used to be how it worked by default. That infuriated many users.

However, new versions often have new features, change existing features or remove features. These may change existing workflows. New versions can also introduce new bugs which may slow down, freeze or crash your system. That's frustrating when your existing version may have been rock solid.

Adobe's response was to make the new default to keep older versions (as it used to be pre-Cloud) and allow users to choose when they are ready to uninstall older versions. I prefer it that way.

There is a check box when installing new versions so you can remove older versions if you prefer.

Good morning, IamMyself.
If the CCDA setting is not always set to the latest version only, installation when a new version is released will be added.
If the old version is unnecessary, it must be uninstalled.
On the other hand, there are people who are in trouble if they disappear.

This is the automatic update setting screen in the CCDA settings. Although it is OFF in the image, automatic update (function to always make sure only the latest app) is enabled by moving the slider to the right.