Aternos Server properties

Hello, this is my first post here.
I'm trying to change a setting in my aternos server, it's capping my view distance (render distance) to 10 and no matter how i change it in my client it won't work.
I'm trying to figure out which file in the server that could have that option and if it's possible to change it to something like 20. Thank you.

Oh right, should have figured that out, thank you.