Do adjustable length lightsabers exist in Star Wars universe?

I always see blades of lightsabers have more or less the same length (dual blades are double). Why is that?

Can't a longer or shorter length be advantage in some case?

I am NOT expecting infinite length lightsabers (due to energy issues), but have we seen adjustable length blades in the Canon?

Answer

According to the Star Wars: Visual Dictionary and Force Awakens: Visual Dictionary, Lightsabers have Blade Length Adjust knob using which one can adjust the length of lightsaber blade.

Although this shows it in Anakin's lightsaber, Kanan's lightsaber (Star Wars: Rebels TV series) also had this feature.

(Kanan confirmed this feature verbally in the same scene of Star Wars: Rebels S01E03)

So, the length adjust feature of a lightsaber can be considered norm.

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