Customise a start page in Safari on Mac
You can put everything from the web that’s most important to you in one convenient place, the start page.
In the Safari app
on your Mac, choose Bookmarks > Show Start Page.Click the Options button
in the bottom-right corner of the window.Select options for your start page.
Use Start Page on All Devices: Select this to use the same start page settings on your iPhone, iPad, iPod touch and other Mac computers. You must be signed in to your other devices with the same Apple ID as on your Mac and have Safari turned on in iCloud preferences. You must also turn on two-factor authentication on all your Apple devices. See the Apple Support article Two-factor authentication for Apple ID.
Tab Group Favourites: Show websites you’ve added as favourites to the selected Tab Group.
Recently Closed Tabs: Show websites from tabs you’ve recently closed in the selected Tab Group.
Favourites: Show websites from the bookmarks folder you’ve chosen in General settings. See Change General preferences.
Frequently Visited: Show websites you’ve visited often or recently.
Shared with You: Show videos, news stories and other links that friends shared with you using the Messages app.
To see items in Shared with You, make sure Safari is selected in the Shared with You pane of Messages preferences. You only see items shared with you by people who are in your Contacts.
Siri Suggestions: Show suggested websites found in Messages, Mail and other apps. If Siri Suggestions isn’t listed, you can turn it on. See How Siri Suggestions work.
Reading List: Show web pages you’ve selected to read later.
Privacy Report: Show a privacy summary, which you can click for details about who was prevented from tracking you.
iCloud Tabs: Show web pages open on your other devices.
You must be signed in to your other devices with the same Apple ID as on your Mac and have Safari turned on in iCloud preferences.
Background Image: 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.
Drag start page options into the order you want them to appear.
Click in the Safari window.
You can have the start page appear whenever you open a new window or tab. See Change General preferences. You can also see the start page by clicking in the Smart Search field. See View your Favourites.