How to disable folding in vim?

Issue

• How to disable folding in vim?

Sample text:

$ cat /tmp/test.inp
*
test
*
a
b
c
*
*

You can see a folded line using vim.

$ vim /tmp/test.inp
*
test
*
+--  3 lines: a------------------------------------------------------------
*
*

To view the text, open the fold by typing:

        zo

And you can close the fold again with:

        zc