I am trying to Reduce the Marker size for all the Slides, I need to do one by one to achieve this and it takes lot of time.

You can now change the marker size for the whole guide instead of each step. You can find this in the Customize section. However, If you've customized the marker size for any step, it'll override the guide settings for that particular step.

I hope the developers can address this problem, as I am experiencing the same issue. It is not practical to visit each tutorial and resize it.

Any Update Team ?