In Flux there isn’t a dedicated “wire break” tool that inserts a break symbol into a wire. Instead, you can clean up your wiring visuals by doing one or both of the following:
Reposition wire segments: While in wiring mode, adjust the wire’s elbows by pressing the f key. This lets you change the wire angle and route the wire more cleanly.
Use Portals: Portals let you connect nodes without drawing a full wire, reducing visual clutter for complex connections. Simply place a portal from the library (see the Portal example) on the wire and give it a matching designator on each side.
For more detailed instructions, please see the Flux documentation on wire break.