Many of us facing problem now once our PC is automatically upgraded to Windows 10. We feel uncomfortable with Start button and the Desktop screen. I also faced the same and below steps to helped to change the Start screen.
1. Click the Start button
2. Click the Settings command.
3. At the Settings window, click the setting for Personalization.
4. At the Personalization window, click the option for Start.
5. In the right pane of the screen, you’ll see a setting that says “Use Start full screen” that’s currently turned off. Turn that setting on so the button turns blue and the setting says “On.
Now click the Start button, and you should see the full Start screen.