Edit and customise Tab Groups in Safari on Mac
You can choose the tabs to include in each Tab Group, arrange the tabs, choose a distinct background for the start page of each Tab Group, and share Tab Groups across your devices.
Edit a Tab Group
In the Safari app on your Mac, do any of the following:
Delete a tab from a Tab Group: Open the Tab Group, place the pointer over the tab in the tab bar, then click the Close button
on the left side of the tab.Arrange the tabs in a Tab Group: In the tab bar, drag a tab before or after another tab.
Arrange Tab Groups: In the sidebar, drag a Tab Group before or after another Tab Group.
Delete a Tab Group: In the sidebar, Control-click a Tab Group, then choose Delete.
Rename a Tab Group: In the sidebar, Control-click a Tab Group, choose Rename, enter a name, then press Return.
Choose a background for the start page of a Tab Group
In the Safari app
on your Mac, click the down arrow 
next to the Sidebar button 
in the toolbar, then choose a Tab Group.If the sidebar is open, click a Tab Group in the sidebar.
Choose Bookmarks > Show Start Page.
Click the Options button
in the bottom-right corner of the window, then select Background Image.Choose a background for the start page of the Tab Group.
You can choose a provided image or choose one of your photos (the first option on the left). If the first option shows an Add button
, click it to choose one of your photos. If the first option shows a previously chosen photo, click the Close button to choose a different photo.You can also drag a photo onto the start page.
Click in the Safari window.
You can choose a different background for the start page of each Tab Group.
Keep Tab Groups updated across your devices
Sign in to your other devices with the same Apple ID as on your Mac.
Turn on two-factor authentication on all your Apple devices.
See the Apple Support article Two-factor authentication for Apple ID.