Google Chrome's "group tabs" feature allows users to group related tabs together, making it easier to manage and stay focused. To use this feature, users can right-click any tab and select "Add Tab to New Group", assigning a name and color to the new group. Users can then add other tabs to the existing group by repeating the process or dragging and dropping them into the expanded group. The grouped tabs will have a colored line above or below their names, indicating which group they belong to. To expand or collapse groups, users can click on the group name, while removing tabs from a group requires right-clicking the tab and selecting "Remove From Group". To stay focused with group tabs, users should limit the number of groups, collapse unnecessary ones, and use dedicated windows for specific projects. Additionally, users can save their grouped tabs by clicking on the three dots in Chrome's address bar, selecting Settings, and enabling "Continue where you left off" when quitting Google Chrome.