If you ever lose the address field in Safari it can be very frustrating. You probably can’t find any help in the “help” files and you can’t go looking for help on the internet because you can’t get to the internet without the address field unless you have a second browser on your machine. It is not all that hard to lose it. An inadvertent swipe with a mouse at the wrong time can cause it.
Which, by the way, is a good idea. To have access to more than one browser on your Mac. My recommendation is that you add FireFox. A lot of Mac users actually prefer it to Safari. I’m not one of them, but I do keep it on hand just in case.
If you lose the address field here is how you get it back.
From the Safari Tool Bar select View > Customize Tool Bar.
You have two options. If you have added things to your Safari toolbar, such as the New Tab icon that lets you instantly open a new page, or the AutoFill icon that lets you fill out your personal information on web sites when you select it, then you should select the field with the blue arrow and just drag it up to the Safari tool bar. Your address field and search field will be back in place and your other icons will not be removed.
If you don’t have any extra icons selected from this window, then you can select the field pointed out by the red arrow and drag it to the Safari tool bar.
Then you will be back in business.