This is the default coloring for TRS2019. To make it a bit more like T:ANE:
Go to Edit Environment.
Click on a green dot or the + to add one of your own on the clock.
Click on the reset diurnal color data (right hand white circle with arrow inside).
Confirm you want to do this.
The lighting will change to something that's similar to T:ANE.
If you want to change the water color or other things, you can do that by clicking on the green dot again and adjust such things as the ambient color and sun brightness.