We are excited to announce that the first preview of Vertical Document Tabs is available as part of Visual Studio version 16.4 Preview 2. Vertical tabs give you the option to better utilize horizontal screen space and at the same time gives more vertical space for your code.
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The Preview Features page under Tools > Options > Environment has a new look! We introduced the Preview Features page so that you can easily find these capabilities and be able to control their enablement. The new layout provides more information and an opportunity to give feedback on the features.