The menu bar turns off on safari

Perhaps Safari is in full screen mode.

Try the Control + Command + F keyboard shortcut.

Could be a number of things.

1. With Safari open, click View > Customize Toolbar.

Now drag the default set to the toolbar

2. You could be hiding certain parts of the toolbar, like the bookmarks bar

Click View > Show Favorites Bar OR Show "your-desired-bar-here"

3. If you are in Full Screen, you need to click View > Always Show Toolbar in Full Screen

The Safari Menu Bar? Or THE Menu Bar while Safari is running?