How can I take this out?

[Daniel Ulysses]

Hola Pipol !!!
I'm using AE for a shot period of time and I'm still watching Youtube videos a lot to learn as much as possible, but I cannot find anywhere how can I "take out" this 'bar' that I don't know how, appears once an a while.
My ONLY options has been to close everything and start all over.
So, how can I take this out?
It's so annoying NOT to know something that I think will be so simple and I can't find any information about this bar.  I know that it means something and may be very useful but I don't know what it is or how to take it out.
Thanks for your time

[MyerPj]

That is the Layer bar I believe, you may have double-clicked a video layer in the timeline, and it opens up in a separate window.  You can see it in the tabs on top of that panel, and just close it there. I understand wondering what that is.

[Daniel Ulysses]

thanks a lot, I'll check "the tabs on top of that panel" and see if I can find that.
Again, thanks a lot!

[Rick Gerard]

You would probably benefit from spending about 15 or 20 minutes exploring the Window/Workspace/Learn tutorials (Shift + F12). The User Guide is also a handy resource.