The demo level uses third person character,but if you do not have well configure de Input the character will not move. To solve this problem I have prepared the file: InputDemoLevel.ini dowload it to your computer and inside Unreal Engine 5 with your project open go to: Edit->Project Settings->Engine->Input and click on the button "Import..." (top right of the windows). Choose the InputDemoLevel.ini you have downloaded, and the character will move correctly in the demo level.