Location of Safari Settings

According to Qwant, it is not possible to add that feature to the Safari "Search engine:" field but you can add Quant as a "Homepage."

"Click on the “Safari” tab, and then on “Preferences.”

In the top menu, click on the “General” button (it looks like a power switch!).

In the “Homepage field”, enter the URL “https://www.qwant.com/” and close the window.

Qwant will open by default the next time you launch Safari."

Use the Safari>Preferences... Menu Bar option. You can also use the (command+,) keyboard shortcut.

apple icon upper left> Safari > Preferences ...

You are welcome.