Go to your user data directory, typically Windows User/YourName/Outerra, open eng.cfg in text editor:
renderer_config = (renderer_config) {
screen_width = 1920,
screen_height = 1080,
fullscreen = true,
swap_interval = 0,
msaa = 3,
debug_mode = false,
debug_async = true,
refresh_rate = 60,
disable_composition = false
You can manually set the render configs here.
I've found the the context menu for the resolution in the Graphics settings menu seems to either not have the option (sometimes), or you can't scroll down enough in the menu to see it.
If you are ever having issues after an OT update, it is recommended you delete both eng.cfg and world.cfg and restart OT, which will generate those files from the latest default files. Sometimes an update will not update the parameters in these files and they become corrupted or incompatible with the new version.
P.S. Can you post a screenshot of the mini-Earth inside Earth? I've never heard of that before.
Regards,
Uriah