The wavy bit of ocean is meant for the playable area and has close up ocean effects,
The flat bit of ocean is for distance visuals only and should be off in the distance
the waterline of the distance ocean sits below the waterline of the wavy ocean, so the waves don’t dip below it and show void.
There is an actor in the outliner called Waterzone, its used in conjunction with the ocean and its extents define the border where the playable ocean meets the distance ocean
make the waterzone extents and the ocean extents about the same size and make them big enough to contain your whole island and playable area.
so for example a medium island maybe somewhere between 80,000 to 128,000 for the x and y extents of both ocean and Waterzone should work.
The ocean collision extents can use half the value of the extents (measures diameter instead of from centre)
the idea is to make the wavy ocean meet the flat ocean far enough away from where a player can discern the difference