What's this "drawer" in the task switcher and how to configure it?
That section is showing predicted apps. This feature was introduced in Android 9, along with their changes to the recent apps screen. I'm not sure if there's a common name for that UI element, but I found relevant info when searching for &quot;predicted app drawer&quot; and &quot;app suggestions&quot;.
AFAIK, you can't customize this - the apps that appear are predicted by the system based on your usage, so over time it will learn and (hopefully!) get better at showing you apps that you're likely to want to use soon.
I don't have access to a Samsung phone to test with, but you can turn it completely off in stock Android 9. You can see screenshots here.

Long-press on the home screen
Tapping &quot;Home Settings&quot;, then &quot;Suggestions&quot;
Toggle &quot;Apps&quot; off