My safari address bar has disappeared

1 If Safari window is in Full Screen mode, press the esc key and test.

2 Check whether Safari's view options are changed or not.

Close all windows.

Right click the Finder in the Dock and choose "New Finder Window". (1)

Click "Applications" in the Finder sidebar, right click Safari and choose "Show View Options".(2)

When the small window opens, do you see any different setting compared to the one shown here? (3)

Try booting into the Safe Mode to see if you can access Customize Toolbar.

Safe Mode - About

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor.  Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

If the log won’t post, try posting it in Pastebin and provide a link in a reply        Pastebin