If I understand your question correctly, click on your avatar in the bottom left corner and select Personal settings. Then scroll down to the Jira labs section and switch on the new issue view. Then, if you click on an issue on the board, it opens a pop-up modal window
I'm assuming you're talking about the Backlog, not the Active board.
If you have the new view switched on, then clicking an item on the Active board opens the pop-up modal. Clicking an item in the Backlog will open the right hand pane - i don't believe there's any way to change this. All you can do is click on the key (ABC-123) whilst holding the CTRL key to open it in a new tab
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events