The Titan Two is an adapter which, amongst many things, lets you use alternative controllers on different platforms. For instance, if a PlayStation or Xbox controller (check the Titan Two website for compatibility) is more suitable for you, you could use the adapter to use your preferred controller on a Nintendo Switch console.
When using the adapter on certain consoles, it is important to create a wired connection. To use a Titan Two on a Nintendo Switch you will need to change the Pro Controller Wired Communication to On. This post shows how to do this in the Ninetendo Switch’s settings.
To get there go to System Settings > Controllers and Sensors > Pro Controller Wired Communication > Ok
The screen shots below show this process:
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