I was trying to use stepper with Linear orientation, using the examples as said at docs:

Linear stepper is a compontent which is the most common. If you need to activate linear mode, add [linear]="true" input to the mdb-stepper component.

When you are working with this stepper you have to put a correct values to do more steps.

<mdb-stepper #stepper [linear]="true">
  <mdb-step name="Step 1" [stepForm]="firstFormGroup">
    ...

That code didnt work, but i figure out when see non angular examples and use [vertical] ="true" instead of [linear] = "true"and it work.

Please update docs,