The songs in Liked Songs are songs that you saved or songs from albums that you saved to Your Library. It's not possible to delete this playlist, but if you'd like to empty its contents, you can use the Desktop app to select all songs (CTRL/CMD +A), right-click and choose for: 'Remove from your Liked Songs'.
Right now, it's not (yet) possible to hide Liked Songs in Your Library. If this is something you'd like to see, I recommend creating a new idea on the Ideas board. That way, Spotify can keep track of it.
Feel free to give me a shout, if you have any questions!
Have a good one,
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