In Discover you have the ability to switch between existing index patterns. Those are not automatically created for your data, but you have to go into "Management" and configure them there.
Each created index pattern is exclusively visible in the space it was created, so if you have multiple spaces, you have to re-create the index patterns want to use for each space.
In your scenario it looks like there are multiple index patterns configured in the IT space, but in the users space there is only a single index pattern (that's why the change button is hidden)
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