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I remember seeing it in a random thread, but I can't find it. Ultimately I want to extend the reach of the sectors so they can encompass more planets, and I don't need to spam 90 leaders for 90 1 planet sectors.
You can mod the game. The files you need to change are in the Stellaris/common/sector_types folder: 00_core.txt and 01_other.txt. Look for the max_jumps = 2 and change the number to whatever you'd like the sectors to cover.
Under /common/sector_types there are two files, 00_core.txt and 01_other.txt, for core and frontier sector, respectively. The "max_jumps = 2" at the bottom of these files determines how many hyperlane jumps before the game will create a new sector. I've personally increased it to 8, which gives me fairly large sectors.