There isn't any way to resize the document structure view. Sometimes resizing would be needed if the paragraphs' titles are too long.
I can confirm that it is an issue with MS Windows version too. It is really big usability issue.
OS: Linux → All
Priority: -- → P3
Hardware: x86_64 → All
Whiteboard: [pdfjs-c-ux] → [pdfjs-c-ux] https://github.com/mozilla/pdf.js/pull/4190
Status: NEW → RESOLVED
Last Resolved: a year ago
status-firefox58: --- → fixed
Depends on: 1415002
Resolution: --- → FIXED
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