You will need to use an FTP client and edit the WorldGenerator.eco file, the values you will want to edit are the x and y values under the Dimensions area.
Why didn't I realize we have a separate forum section for PS4 and PC , my apologies, but as I stated, we will make it available as soon as it is possible.
What platform is your ARK server, if it is PC, you can find the toggle box to set the Easter event in the Advanced Launch Parameters. As for PS4 servers, we will be adding the event as soon as we are able to, as the devs have not made it available to us yet.
I will have this looked into, thank you for reporting the issue! I find it very odd that the server and ini will accept the change, but the game will not react.
So the seed is being updated in your control panel, but there is no visible changes to the map in game, or are neither changing? I was able to test on a server and I got the seed to change in the panel.
You will just need to add a new value into the "World Seed" field, check the Clean World Save checkbox, and then click the big green "Save Settings and Restart Game Server" button found at the bottom of your control panel.