How set the Landscape extent/size to 2048 (Gaea -> UE5 workflow)

Development Rendering
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Hi,
I’m very new to Gaea→ UE5 workflow and I’ve been trying to use the mask map from Gaea to UE5

This message pop-out. I understand the map coming from Gaea is 2048 map, however the Landscape extent is 2017. But I can’t seems to set the Landscape Extent to 2048?

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image1055×302 82.6 KB

When I clicked Ok, the texture mask became very stretched. Is there a way to fix this issue?

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image1920×765 377 KB

Thank you.