Columns in files-window (and more)

Helo Forum,
While opening a folder with music files (MP3), I get so much unwanted columns such as "artist", "duration" and other blabla which I want to get rid of.
So I click on Tools-folder options-columns, and remove them all, click on apply-OK and they gone.
The next time on opening that folder they are back again, so I do the same and save it for all the folders but it is back again. :angry:

I like the size of a file being expressed in KB, so I change it as described above, the next opening it is again "auto", and I "apply' it and "ok" it but its coming back.

And another thing, how do I get rid (if possible) of the small tab which is under the file-window at the left corner (it is actually the opened folder).
Thanks in advance for any help.
L.J.

Sounds like you need to read this FAQ:
[Folder Formats: Quick Guide)

The other thing you ask about, the Folder Tab, can be turned off in Preferences / Listers / Folder Tabs.