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Add a favorite website to a Tab Group in Safari on Mac
You can organize favorite websites in your Tab Groups.
Turn on Tab Group Favorites
In the Safari app
on your Mac, click a Tab Group in the sidebar.
If the sidebar is closed, click the Sidebar button
in the toolbar to open it.
Choose Bookmarks > Show Start Page.
Click the Options button
in the bottom-right corner of the window, then select Tab Group Favorites.
Add a favorite website to a Tab Group
In the Safari app
on your Mac, move the pointer over the Smart Search field.
Click and hold the One-Step Add button
that appears at the left end of the field, then choose a Tab Group Favorites from the bottom of the list.