There are Next and Previous VL keyboard shortcuts, they're in the Miscellaneous group. They operate as a ring, i.e. tap Next VL at last VL takes you to first VL (All Books) and vice-versa. I can't recall the default kb sequences.
You could left click the Virtual library button in the Search Bar and select None. There's no Shortcut/Accelerator key for that button and you can't tab to it
That said, a First VL (None) kb short would be nice.
BR