The wires connected together by fuses or hinge points all have a common function, such as power wires, ground wires, signal wires and so on.
In the circuit diagram, all the wires that are directly connected together without using electrical appliances, as long as one of them has a function (such as a power cord), the other wires have that function (all power wires).
Especially in a circuit controlled by an electronic control unit, in order to reduce the number of terminals of the electronic control unit and simplify the circuit of the electronic control unit, the circuit with shared wires is particularly common. Sensors often share power lines and ground lines, but never share signal lines.
Actuators share power, ground, and even control wires. Special care should be taken when reading and analyzing circuits with electronic control units.