How do I make an ocean bigger and not interfere with landscapes? UE 4-27

Hi everyone!

Total noob here so please forgive me. Using UE4 [4.27]

I am simply trying to make my ocean larger than it currently is. I made an island with a desert mountain nearby, and I want to make the ocean a lot bigger.

I attached three screenshots for visual aid. Basically, I click on the ocean then Transform, then Scale, all XYZ are 1.0. Looks good, but I want to make it bigger. So I type in, let’s say 20 for X and 20 for Y and the ocean gets split in half! No matter what values I put into the Transform section it keeps splitting in half and refuses to scale wider or lengthier.

Please help me out, thanks!