Last week our search engine was broken (due to recent Azure Outage), but this week it is working. You should be able to find a lot of the answers to your questions by using the search. Give it a try!
For instance, searching for Zoom, gives this article
You can also try AutoRange / ZoomExtents on just one Axis.
If that is not what you are looking for, we also have an example showing how you can Drag a YAxis to zoom just that axis.
Hope this helps!
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