You can either connect manually (every time you open Tor Browser) or enable it to connect automatically by tapping the On/Off slider for "Always connect automatically" until it's in the On position.
Generally speaking, you don't really want to be downloading anything from the dark web, if you can help it: The dark web waters are swimming with malware, scams, and otherwise unwholesome material.
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The frameworks use fundamentally different programming languages and UI rendering methods and vary in other characteristics.