I have a relatively simple PCB which I designed to manage some features of a analogue door bell system (enable/disable the call, detect the call, open the door). As I am a beginner, I started with KiCad which is a bit complex, but I must say, it is understandable. It is not finished yet, but almost:

I’m editing CM4 Carrier board schematic. The problem is I removed some unused components and flag pins are not connected. But some pins are marked with unselectable circles and I can’t flag “no connect”.
What is this reddish circle? Can I remove it and flag “no connect”?