With the New Jira Issue View, Atlassian is redesigning the way add-ons are displayed with the issues. Here are some tips for you to easily find and use Smart Checklist add-on with your Jira Issues in the new view.

What the new UI looks like

The add-on position on the new issue view can have the following variants: 

1. Menu bar

   1. A user gets a "..." menu button per issue grouping all the add-ons;
   2. Once the user decides to show the add-on on Jira issue - it'll be displayed there fully operational.
   3. 

A short video screencast:

       2. Glance view

An option to open issues in a sidebar on boards became available:

"By popular demand, we've introduced the ability to open issues as a sidebar on your scrum and Kanban boards (rather than the pop-up dialog). If you're a team lead and need to view lots of issues in quick succession, or you need to see a selected issue and the board at the same time, this one's for you. From a board, choose ••• > Open issues in sidebar to set your preference for all scrum and Kanban boards (you can switch back at any time). "

What it looks like:

With this view, add-ons appear in the glance view module with the issues.

What Smart Checklist looks like on the new UI 

By default, Smart Checklist add-on will always appear in the glance view with your Jira issues. Opening an issue, you'll get Smart Checklist icon and the link to open it:

By enabling the setting "move checklist to center panel" in the add-on menu, you'll change the way the add-on is displayed with your issues. It'll be moved to the top and will appear as one of your available add-ons in the menu bar. 

Either like this (if you have multiple add-ons):

Or like this:

Possible Smart Checklist positions in different scenarios

• On the view issue screen (dialog view), you will get the following glance-view of the add-on: 

• On the view issue screen (sidebar view), Smart Checklist will look like this:

• On the edit issue screen, it'll appear like this: 

There is a way to show checklists in a different way: from the glance view to the fully-expanded view. To have it changed, you would need to enable "show checklist in center panel" setting from the add-on menu:

Once enabled, you will get the following position of Smart Checklist:

• On the dialog view issue screen:

• On the sidebar view issue screen:

• On the edit issue screen: 

To return back to the old view, select this option:

To be on track with ongoing changes of the new Jira issue view and know the very latest release plans - start watching the following article from Atlassian:

https://confluence.atlassian.com/jiracorecloud/the-new-jira-issue-view-938040503.html