Window and Group Filtering
At the top of the side panel, you will see a toolbar with two buttons.
Clicking on the button on the left brings up options to filter the tabs in the current window. This menu lets you filter your tab list based on tab group, ungrouped tabs, pinned tabs, tabs with audio playing, or their tab groups (could be enabled via settings). You can select ‘Tabs from all groups’ to reset the filters.
Clicking on the selection option on the right brings up a list of all your browser windows. Clicking on one will update the tab list to show the tabs and tab groups from the chosen window.