On the right side of RIDE, there is a side menu called Environment. When you click on it, your environment view pops up. Here is the place that you can see the variable inside your environment. For variables with complex structure such as Data Frames and list, you expand the tree structure and navigate inside. 

For data frames and matrixes, when you double click on them in the environment, a data viewer shows the content of your variable. You can sort your view or filter based on columns. For large datasets, data view does not overload your browser as it pulls in your data when you scroll up or down:

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