How do i change my wallpaper size in a unactivated Windows 10 such as fit fill tile etc?

To change your wallpaper size in an unactivated Windows 10, right-click on the desktop and select "Personalize." Then, go to the "Background" section, where you can choose your wallpaper. Under "Choose a fit," you can select options like Fit, Fill, Stretch, Tile, or Center to adjust how the wallpaper displays on your screen. After selecting your preferred option, the changes will apply immediately.