toolong (tl) v1.5.0 does not support line wrapping for long lines. Lines are hardcoded with no_wrap=True in line_panel.py. No CLI flag or in-app toggle exists. Long JSON string values in JSONL files require horizontal scrolling.
No wrapping support in toolong — it is a log viewer that assumes horizontal scroll. For JSONL with long strings: (1) jq -C '.' file.jsonl | less -R for wrapped pretty-printed output. (2) fx (Go binary) has a preview pane that wraps. (3) python -m json.tool --json-lines < file.jsonl | less for zero-install viewing.