The purpose of this panel seems to show which user applications are running right now. Can we remove this panel altogether? If we cannot remove this panel, then the best if we could intelhide or autohide this panel, because a user does not need to see this all the time, just when he takes his mouse to the bottom, it must show up. I right clicked on this panel and nothing shows up to enter its settings. Where we can find its settings. If someone knows how we can fix this please write. Thanks. :)
This part is provided by the Window list GNOME Shell extension.
Ironically, it is not part of the default Ubuntu installation/experience. (In other words, you have probably enabled it some time...)
It does not seem to have an auto-/intellihide option.
You can disable it by opening the Tweaks app, going to the Extensions tab, and finding the Window list extension in the list.