The instance types you are seeing are Fast Launch Instances ( which are instance types designed to launch in under two minutes).
In order to see all the types of instances, click on the switch on top of the instance type list that says "Fast Launch", that should display the rest of available instances.
Here is additional info about fast launch instances: https://docs.aws.amazon.com/sagemaker/latest/dg/notebooks.html
Hope it helps!
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