Sengna, you didn't drag the command bar, you merely stretched it. It is still covering your tabs. It appears that your command line is not docked nor is it locked into place. If it were locked you would not have been able to stretch the command line. If it were docked, it would not cover your tabs.
Below are some helpful images. Before trying to move your command bar, click the aforementioned three bars in the lower left of the AutoCad window. Notice the list of selections. There is one called LOCKUI which means Lock User Interface. If it is not checked, you can move your AutoCad window elements including the command line. If it is checked you cannot move any of it. Once you get your command line docked, with the number of lines you need showing, go back and check LOCKUI so it won't move again.