> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/get-started/faq/font-multitab.md).

# Why does font visually change when switching tabs in multi-tab mode?

World's #1 PDF SDK Library for Web, Mobile, Server, Desktop

When switching between tabs in multi-tab mode, you will sometimes notice that fonts set for free-text annotation will have their font family switched.

This occurs because the multi-tab feature exports annotations to XFDF and then re-imports them when switching tabs. During this process, the core engine may substitute fonts if exact matching is not enforced, which can cause the text to render with a different font, such as Arial instead of Arimo.

To resolve this, enable strict font matching to prevent fallback substitution during XFDF import:

[`instance.Core.enableStrictAnnotationFontMatching(annotationManager);`](https://sdk.apryse.com/api/web/Core.html#.enableStrictAnnotationFontMatching)


---

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