Do you want to: Report a bug
OS version: Ubuntu 24
App version: 9.3.0.140
Downloaded from: snap
Additional information:
If I start editing a document I can apply the heading styles as shown in the screenshot.
However, they do not appear in the “Headings” panel on the left side. I tried with different heading styles, but nothing seems to fix the problem.
@green_sparrow
nice bug.
I don’t have it on windows.
tested it on
| Edition | Windows 11 Pro |
|---|---|
| Version | 25H2 |
| Installed on | 11.11.2025 |
| OS build | 26200.7840 |
| Experience | Windows Feature Experience Pack 1000.26100.291.0 |
App version: 9.3.0.140
Installed from Microsoft Store
G’day @green_sparrow,
The issue certainly does not appear on Windows as @TUser suggests.
To resolve the issue, it may be helpful to the support team if you were to include a sample of a document created on your platform, to determine where the issue is; either in the application, or the document code.
Hey @green_sparrow, 
Thanks for the report and screenshot.
I tried reproducing it on Ubuntu 24.04 (same as you), (OO Desktop 9.3.1) but headings do appear in the sidebar for me after applying Heading 1/2/3 styles. Could you please record a short video showing the steps?
It would be especially useful if you could enable non-printing characters (Ctrl + Shift + 8) before recording — this will show if the paragraph marks or section breaks are affecting the heading recognition.
Upload the video to ONLYOFFICE DocSpace, kDrive, or any file host and share the link.
Hi @DavidRGreen and @DavidRGreen , thank you for your replies.
I recorded a video here: https://docspace-uw5ydy.onlyoffice.com/s/7TZRcLQFp54m__t
The corresponding document is here: https://docspace-uw5ydy.onlyoffice.com/s/4NTZXFLsWThK-Kc
If you need more information from me feel free to reach out!
The information that you provided was very illuminating. And poor @Nikolas got missed in favour of my double mention.
In the video, I saw you type “Test 1” followed by shift-home to select the typed text, then press the Heading 1 format button on the toolbar.
There-in lies the problem; your selection did not include the " ¶ " character (that character is called a ‘pilcrow’; I learnt something today).
When the pilcrow is selected, the style change applies to the whole paragraph, not just to the text. So while it looked like a heading, in fact it was only the text had the same character format as a heading, but not the functional formatting of a heading.
So, when you select some text to become a heading, select the whole paragraph, including the pilcrow, even if it is not displayed.
You can see the selection includes a hidden character; the undisplayed pilcrow, or ‘end of paragraph marker’.
If you are going to select the paragraph like you did in the video, the easiest may be to tap “Home” to bring the cursor to the beginning of the line, and then tapping “shift-End”. Triple-clicking in the gutter to the left of the paragraph should also do the same job.
Once selected, tap your heading style choice, and done.
A common convention is, at the beginning of a line, tap the heading style button, type the heading text, and when you tap the ‘Return’ key, the following paragraph is set to ‘Normal’. That avoids the selection process in setting styles, but the important thing is to select the whole paragraph when going back over existing text.
Only whole paragraphs marked, and styled, as a heading, are recognised as a heading. And will appear in the ToC, and the aforementioned Headings panel.
Does that make sense?
First of all, you are right and I missed @Nikolas . Sorry for that!
Furthermore, thank you soooo much for taking the time to investigate the issue! This really helped me a lot to understand the problem.
