You have the extension button, a tab context menu (right clicking on a tab) and thats it.

The extension can do a lot, but basically you go to the extension icon in the extension area and create groups, you click on the group and all other tabs are hidden away. Then you open tabs here, you can right click on a tab to move between groups and also set the tabs favicon (the small icon) as the tab group icon.

You click in the menu on another group and the current tabs are hidden and you move there.

It can also work with container tabs (isolated cookies) so allow to use multiple accounts, and I think the hidden tabs are frozen, taking less RAM and CPU