Sideloading Outlook 360 add-in on Outlook main window - outlook

I want to side load Outlook add-in to Outlook main window. Just like Nutshell add-in in below screen shot. I looked at the ExtensionPoint help, but there is no extension points available which can show add-in like below. Please let me know how I can achieve this.
https://learn.microsoft.com/en-us/office/dev/add-ins/reference/manifest/extensionpoint

MessageReadCommandSurface extension point will provide you with this view. As you may notice, to invoke the "Nutshell" add-on the app's icon is above "read message" view.

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Outlook web addin issues

I am developing an Outlook Web Addin using Fabric UI.I have run into couple of issues which are given as follows:
The following is my outlook web addin screen shot:
1:
Issue #1 : I do not have access to addin title "My Test Outlook Web Addin" from within my code. I want to change the CSS properties of the title but I do not seem to have access. This title is defined in an XML file.
Issue #2: I have "Save" and "Cancel" buttons. In their call backs I need to perform some task and close the addin dialog. But I am not able to close the addin dialog. I can close the addin by clicking 'X' icon on the top, but not from within my code.
Issue #3, How to get file types icon with plane JS? (https://developer.microsoft.com/en-us/fabric#/styles/web/file-type-icons)
I am not using React or AngularJS. I am using Core fabric UI with plane JS.
Any help on these issues and on how to control properties of outlook web addin is highly appreciated.
Thanks!
For Issue #1: It is currently not possible to change the styling of the title bar. We track Outlook add-in feature requests on our user-voice page. Please add your request there. Feature requests on user-voice are considered when we go through our planning process.
For Issue #2: You can use the closeContainer API to close the add-in task pane.

Can I add a button to my add-in next to Send/Discard buttons?

I am writing an Outlook Add-In (Web version, Desktop) and so far I was able to add a link to my app in the contextual menu (see screenshot below - highlighted in yellow). This work well, but it is almost impossible to find the add-in and this is resulting in a ton of customer support calls. I was wondering if there is a way to add the button next to "Send", "Discard", or after the "Elipsis" buttons. This way the add-in would be more visible.
I was thinking about directly modifying the DOM if it is not possible, but I would prefer to not do that.
You can add a button there neither from a web based JS addin nor from a COM based addin for the desktop version of Outlook.

How i can add button to main menu not inside message

How to add button to main menu behind "Mark all as read"
instead of showing button inside email body read document but it doesn't help me to find solution,
You cannot get your add-in icon displayed in any place you like. The add-in controls are defined by manifest and displayed in predefined locations of particular client (Outlook Web, Outlook desktop for Windows or Mac, Mobile). Up to developers (Microsoft team) to define the place where the add-in controls will be displayed.
EDIT:
There are two places where add-ins may appear in the client interface. This depends on what type of add-in you have created. There are command add-in and contextual add-in. Both of them will appear somewhat in the space of the message view anyway. The following are examples of where they appear withing the interface ...
And for web view ...
To read more on Outlook add-ins Extension points got to Outlook Add-ins overview article.
Currently the feature you requested is not a part of the product. However, we track Outlook add-in feature requests on our user-voice page. Please add your request there. Feature requests on user-voice are considered when we go through our planning process.

Outlook Add-in: Does Outlook Horizontal Add-in View Exist?

I’m a developer working on an add-in for Microsoft Outlook. We are running into a UI bug with certain window sizes. We are having problems resolving this, because we are supporting a horizontal add-in view that we encountered on Outlook on the web in 2016 (please see links below for examples). We haven’t been able to find this view/layout anywhere over many Outlook platforms. Is it safe for us to assume that the horizontal read view has been completely replaced by the add-in commands version that opens the taskpane on the side?
Example One
Example Two
#K. Yu, horizontal add-ins are no longer supported, so use Add-In commands or Contextual Add-ins, depending on what suits your needs.
Check out this blogpost with more information.

Vertical pane icon in Outlook Web App (OWA) is no more showing

I am developing an outlook add-in targeting OWA, Outlook 2016 for Mac & Windows. Few month back when I started and testing the application, the small icon to activate the add-in was showing. But the icon is no more showing with same manifest and all setting same. Please refer the screenshot.
Is this part of any update from Microsoft? How I can fix it?
Thank you in advance.
OWA uses the IconUrl in the section above version overrides because it uses the addin icon while Outlook desktop clients use the individual control icon. It looks like you found this but I just wanted to add this answer so it is more visible.
An additional note here, <IconUrl .../> should be above <HighResolutionIconUrl ../> element otherwise manifest does not pass the validation.

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