How do I make each item in the data viewer clicked open a different screen?
Hi marceloobrito11e0, welcome to Thunkable! 
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There are two things to consider here: Items in a data viewer each have a row ID attached to them
and if you are using a data viewer, you’ll have to connect a data source. So you can use that Row ID and the data source blocks to populate the data on the specific page.
Our Thunkable Academy uses a similar idea with an employee directory app. I would suggest taking a look at it and basing the logic of your app off of the employee directory.
Happy Thunking!