jEdit supports "folding"; a "fold" is a section of a buffer that can be hidden and shown by clicking in the gutter or using the commands in the Folding menu. Folds can be nested.

Two folding modes are supported; "indent" and "explicit". In the former, folds are created based on the leading indent of a line; in the latter, the buffer is parsed for the strings `{{{` and `}}}`.

Folding can be enabled in the Buffer Options and Global Options dialog boxes.