By default, to switch tabs using the Window Panel, you need to double click on an entry to activate it. If you’d like to switch tabs with only one click, like on the Tab Bar, you’ll need to enable a setting for it.
To enable single click tab switching in the Window Panel:
Have you opened multiple windows with numerous tabs in each and now things look a bit too chaotic. The best place to organize your Tabs across Windows is the Window Panel.
To move tabs from one window to another:
Using drag and drop it’s also easy to reorder tabs within the same window.
Let’s say you want to get a tree-style view of your open tabs. All you need to do is open the Window Panel. Click on the 
Window Panel icon on the Panels bar and you will have a tree-style view of all your open tabs on one side of your browser window.
From the Window Panel, you can, for example, drag tabs to change their order. You can create a Tab Stack by dragging and dropping one tab over another. Also, you can even tile Tab Stacks to view them side-by-side by right-clicking the Tab Stack and select Tile from the context menu.
When you have so many tabs open that you can no longer see their titles on the Tab Bar, you can use the Window Panel to review and close the ones you no longer need. Just hover over the tab and click on the 
Close button on the right side.
If you want to hide the Tab Bar, the Window Panel is a good way to manage your tabs.
