UE4 4.25.3 not responding on landscape creation

Unreal Engine World Creation
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#1

Hello i am beginner to UE4 and i have problem i cannot create landscapes it just freezes and in process says not responding.
I can create 63x63 but if i use anything bigger it just freezes is is my pc to weak to handle it or what.
Materials used grass and default chessboard

Ryzen 1700x
AMD RX480 8gb
16gb ram
250gb ssd

#2

I also had the issue where when I flatten the landscape the screen freezes. I found that by disabling the combined layers operation settings in the flatten tool panel the issue is solved. You might want to check whether you have multiple layers, hope this helps you.