shadows turning landscape to words

i made a sand material, but anywhere i can see shadows, it has this tiled “preview” texture.

How do i fix this, or is it something that will go away when i build the final?

you need to build the lighting. what you’re seeing there is the ‘preview’ shadows, ie dynamic shadows being cast from a static or stationary light. under build, click ‘build lighting’ to build the lighting and make the shadows work.

click the arrow on right of building => go to lighting quality => set it to anything other than preview and you’ll have the desired results.
“Preview” word just comes as a mark and notification that you’re working with preview shadows !