> 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/uwp/changelogs/version-8/v8-1-0.md).

# Version 8.1.0 Changelog (January 7, 2021)

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

Version: 8.1.0

Release Date: January 7, 2021

## Notes

More information can be found on [What's new for cross-platform APIs](/core/changelogs/version-8/8-1-0.md).

## Improvements

* \[tools] Reduced bounding box when creating a Free Text annotation to save real state
* \[tools] Added `ThumbnailViewer.DoubleTapToNavigate` property to require double tap/click to navigate to selected page

## Bug Fixes

* \[pdf] Removed focus border style from PDFViewCtrl when using keyboard arrow keys to change pages
* \[tools] Fixed exception when instantiating ThumbnailViewer control
* \[tools] Fixed Undo and Redo what would cause multiple event to happen when loading a new document by calling `PDFViewCtrl.SetDoc()`
* \[tools] Fixed exception caused when using Pan tool and holding touch
* \[tools] Added a minimum annotation size during resize in order to avoid manipulation issues

## New Features

* Updated Annotation Toolbar icons and added tool color feedback to the selected tool

![](https://3246663708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Frgmys2szYV2Z567Zu3vi%2Fuploads%2Fgit-blob-bee2ffee10391971b296ab7724f6ba73d1c7379a%2Faefc58a17d1c3f95fb862caf5d9474eba1b08b60-1236x546.png?alt=media)

* New Marquee Zoom tool which allows zooming into selected regions of the document

![](https://3246663708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Frgmys2szYV2Z567Zu3vi%2Fuploads%2Fgit-blob-4f1c2662172f4cec5cd5b435fa423c047efb5c0e%2Ffa52dd058731d00677279f969359d59e02263991-1374x548.gif?alt=media)

* Updated ThumbnailViewer control by adding an overlay to each page for a better UX

![](https://3246663708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Frgmys2szYV2Z567Zu3vi%2Fuploads%2Fgit-blob-840d5f11d0ea9f31a384c5b4ceae2cabc861ea48%2F900f3bd11c98005a0988531c241c22a8740aa004-841x719.gif?alt=media)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.apryse.com/uwp/changelogs/version-8/v8-1-0.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.