Landscape Materials - Why are there large squares?

[hiracode]

Hello,

I’m a beginner and following a course. When I try to add a Megascans material to a landscape I get these large squares that the course instructor doesn’t get. Any ideas why this is?

System:
Macbook Pro with M2 chip
UE 5.4

[ClockworkOcean]

Try making your directional light moveable.

[hiracode]

Thanks! That seems to have resolved the issue.