ClosedXML / ClosedXML/ClosedXML.Report

Can we use group merge label in horizontal table?

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Dominant language
C#
Stars
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Forks
122
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Description

i want to use group merge label in horizontal table to merge header cell
![image](https://github.com/user-attachments/assets/36635145-068e-480e-9615-f41178314020)

i want to merge those cell of 3 blocks highlighted
![image](https://github.com/user-attachments/assets/1edf55a5-727f-4af7-a962-a92bd1d1ae99)

Contributor guide

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Research direction

Start with the issue description and screenshots, then locate the horizontal-table handling and the existing group-merge label behavior. Clarify the expected merged header output for the three highlighted blocks and verify the result in an exported XLSX template.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
backend
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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