This may be very rare, but in Legends, has someone used the Force to actually destroy their opponent's lightsaber?
Ahsoka Tano once made a lightsaber explode with the Force. She may not have been trying to destroy it, but she was certainly trying to disable it.
Sensing her intent at the last moment, the Inquisitor tried to disconnect his weapon and fight her with two blades instead of one, but it was spinning too quickly for him to do it. Ahsoka’s hand landed almost gently on the cylindrical metal, and the Force was with her. The hilt cracked at her touch.
A sharp whine reached Ahsoka’s ears, the dark and light song of the crystals struggling for balance. She realized she needed to jump back even farther. She must have nicked the power connection that channeled the crystals inside his hilt, and now it was overloading. If he didn’t deactivate it soon, it was going to explode.
Before she could even consider shouting a warning, the red lightsaber burst into a mess of noise and light. Bright spots pricked at her eyes, and then all was quiet. The creature wasn’t going to bother her anymore.
One presumes, of course, that this is a difficult maneuver, one that depends on one’s opponent being sufficiently outclassed for one to touch their lightsaber, and not able to sufficiently defend their weapon using the Force (as would also be the case, for example), when grabbing an opponent’s lightsaber with the Force. It also seems that being able to touch the lightsaber makes things easier, so destroying a lightsaber from afar might be even harder.