Why isn't this filter already present - when looking for a world to take, you don't look at your own worlds, and you don't look at Legion worlds... you look at what is unoccupied or owned by an enemy.

Can we get that filter?

It's already there. There's a little panel of about 4 or 5 icons in the top-right area of your planet list. Click to filter.

Yeah there is also a ( Filter Planets by Name: ) so if you wanna just look at Gas planets, or if your looking for just research planets just type in the name and there you go.

I think you failed to read what he actually asked for.. i think he acknowledges the fact they exist but wants another filter. Personally, i agree... having a filter for just foreign/unocc would be great.

But what i think would be better is being able to sort by development level?

There is all you have to do is type it in there ( unoccupied or anything elis in the box ) and there you go.

First hit the "Show All Planets" button and then click on the column heading "Control" and it will list them accordingly. In fact, all the columns can be sorted this way. This also works on the Ship tab, battle tab, and the artifact section of the trade tab.