> 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 by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

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

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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.