The tab titles display all in a single line in the English interface. But the Chinese localization shows unexpected line wrapping on the “Conversion” label, despite there being no explicit line breaks in the translation strings. So it seems to be a rendering issue. For reference, this display anomaly has persisted since at least version 1.0 when I first started using Siril.
Looks like an issue on your side:
It is from a tutorial blog, using Siril 1.0.0: https://bbs.imufu.cn/thread-811181-1-1.html
It is from a tutorial video, using Siril 1.2.0: 天文后期入门siril软件功能和界面介绍_哔哩哔哩_bilibili
It is from a tutorial blog, using Siril 1.2.1: 基于Siril等图像处理软件的玫瑰星云(NGC2237)后期处理 - 如约而至
I changed “转化” to “转换” in the translation through Weblate (these two words have nearly identical meanings in Chinese). Will it make a difference?
I’ve pushed your changes, let me know.

Here’s a screenshot from another tutorial, showing no wrapping in version 0.9.12.
Widening the tab page still cannot prevent line wrapping.
Please try again. I’ve updated the UI.