I'm playing Stellaris. The tutorial AI has been repeatedly (literally non stop) telling me to create sectors.
There is a Planets & Sectors menu as part of the main menu bar (it's even mapped to F4). It does not contain a "create sector" or "split into setors" or any such sort of UI element.
I've looked long and hard through the UI, and nothing solves this issue
I've tried clicking on outside the menu onto solar systems while the Planets & Sectors menu is open, and I've tried unfolding the only sector I have and clicking everywhere within that.
I get taken to different other parts of the game. This planet, that leader, my empire tab, etc. etc. etc… nothing is meant as a create sector button.
I've also dug up old screenshots in this thread:
https://steamcommunity.com/app/281990/discussions/0/357286119102514045/
In which you can see a "Create new Sector" button, but the interface has clearly changed since then.
Best Answer
As shown in this dev diary, starting in version 2.3 the option to form a sector is located in the planet window. The button has the "three hexes" sector icon and a plus sign, like so:
This will create a new sector centered on the chosen system that includes all other systems within four jumps. Your capital starts out as the center of the core sector, and any colonies you found within four systems will join that sector automatically.
Note that the option to create a sector only shows up if the selected planet is not already part of a sector. For non-core sector worlds that button disbands the sector, for core sector worlds it allows you to move your capital, and for your capital it does nothing.