macOS Sierra 10.13.1 Safari 11
Safari window in normal mode
The bar with logo is the application menu bar. On this Mac it is pale green because of the desktop picture.
The bar with red(close), yellow(minimize) and green(full screen) buttons is the toolbar.
To show both menu bar and toolbar, don’t enter Full Screen mode.
Launch Safari and drag the corners of the window to resize the window to fit the it under the menu bar.
Safari window in Full Screen mode
It is normal that these three red, yellow/gray and green buttons will not be visible.
If you move the mouse pointer to the top edge of the screen, Safari menu bar Toolbar will drop down as shown below.
To show Safari menu bar and toolbar with all these three button always, resize the window without entering Full Screen mode.
If this doesn't help:
Go step by step and test.
1. Delete Caches and test.
Close all windows and quit all applications.
Hold "option" key down and click "Go" menu in the Finder menu bar.
Select "Library" from the dropdown.
Library > Caches > com.apple.Safari
Right click the com.apple.Safari file and select "Move To Trash.
Close windows and relaunch Safari.
2. Delete com.apple.Safari.plist file and test.
Backup your Mac.
Empty the Trash.
Quit all applications.
Hold the option key down and click the "Go" menu in the Finder menu bar.
Select "Library" from the drop down.
Library > Preferences > com.apple.Safari.plist
Right click on it and select "Move it to Trash".
Restart and relaunch Safari. Click “Start using Safari” link at the bottom.
If this doesn’t help, “Put Back” the com.apple.Safari.plist
Right click on the Trash icon in the Dock and select “Open”.
Right click on the com.apple.Safari.plist and select “Put Back”.
Choose”Replace”.
3. If Safari doesn‘t load a page or webpage items are missing
https://support.apple.com/en-us/HT204098