No, the length of the step is determined automatically according to the personal information of the user (size, age...) registerd during the creation of his iHealth account.
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/212032545-iHealth-Edge-AM3S-Can-I-set-the-length-of-my-step-