Deleted your top GNOME panel accidentally in your Fedora Box.Then
1.Right click your panel, then go to New Panel. This would give you a new top panel.
2.Right click the New Panel->Add to Panel.
3.Then add the following
- User Switcher (A menu to quickly switch between users)
- Menu Bar (A custom menu bar) / Main Menu (The main GNOME menu)
- Notification Area (Area where Notification icons appear)
- Clock (Get the current time and date)
This will give you the basic GNOME Panel. You can add more applets according to your needs.