How to change the double-control switch into the single-control switch?

Just twist the wires of the same color together and connect them at both ends of the single control switch.

If you want to change the single control to double control, you must change the line and add one more line. Generally, there are two terminals behind the single control switch and three terminals behind the double control switch. The first point of changing single control to double control is the zero line, which does not enter the switch. Among the three terminals L, L 1 and L2 with dual control, there are two L's which are respectively connected to the live wire and the bulb control wire. Finally, connect the L 1 terminal in the two switches to the L2 terminal in the other switch.

Extended data:

Matters needing attention in using single control switch:

The switch should be installed by a professional electrician to avoid electric shock caused by improper operation, or the switch cannot be used or the circuit is burned.

Double control switch can be used as single control switch, but single control switch cannot be used as double control switch.

The switch must be installed by a professional electrician to avoid safety accidents such as electric shock caused by improper operation, and losses such as incapability of use or burning out of the circuit caused by installation errors.

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