Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 321)

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Movie Servo AF Speed
o With certain lenses, even if you adjust the AF speed, the speed may not
change.
o Available when [
z
: Movie Servo AF] is set to [Enable] and [
z
: AF
method] is set to [1-point AF] .
o Operation when [
z
: AF method] is set to an option other than [1-point AF]
is equivalent to setting [AF speed] to [Standard (0)] .
o An asterisk to the right of [
z
: Movie Servo AF speed] indicates that the
default setting has been modifi ed.