LOL. Full screen. Yes. Did not change anything, though. :O)
Do you have ANY toolbar displayed?
1. Go to Menu —> View —> Toolbars —> Customize...
2. In the dialog that comes up, choose Create New Toolbar or restore defaults.
Create such using any name, anything.
3. Click Done
The new toolbar shall be perched beside the Menu bar, you can leave it there or drag it elsewhere. But it doesn’t matter.
Once you have any toolbar, just right click in a blank area of the toolbar and select Customize... you can then select anything you want to rebuild the toolbar.