Turn on your TV or monitor and use your remote to select the HDMI input you connected earlier. Your Switch 2 will automatically detect the connection and switch to docked mode for big-screen gaming.

A feature in iPadOS 17 enables iPads to work with USB-C capture cards. Here's how to use the feature to make your large-screen iPad work as an external monitor for your Nintendo Switch.

With those two things, you can connect the Nintendo Switch to the adapter via HDMI cable, then the adapter to iPad, open up Capture Pro, and start playing games on a (slightly) larger screen.