If you customize the command ribbon, you can restore it to the original settings.
Click the Customize Quick Access Toolbar arrow , and from the menu, choose Ribbon Themes. From this list, select Solid Edge Default.
Open the Customize dialog box using one of these methods:
Right-click a command on the ribbon and choose Customize the Ribbon.
Click the Customize Quick Access Toolbar arrow , and from the menu, choose Customize the Ribbon.
On the right-hand side of the page, for Theme, select Solid Edge Default.
Select Close.