Two sets in one table?

While I’m here would it also be possible to add a TH cell to the columns with the set title in (ie ‘Bar’ and ‘Kitchen’)?

Hi, sorry for the late reply.
This is currently not possible. The only way of doing it would be to interact with the API programatically and then create the markup itself (you could use Set Aliases and presets and then the OverviewModel class to have the opening hours arranged and grouped).

Reference to this:

1. interacting with the API: https://github.com/janizde/WP-Opening-Hours/blob/master/doc/developer-guide.md#developer-guide
2. adding set alias presets: https://github.com/janizde/WP-Opening-Hours/blob/master/doc/filters.md#op_set_alias_presets
3. OverviewModel class (refer to method doc): https://github.com/janizde/WP-Opening-Hours/blob/master/classes/OpeningHours/Module/Shortcode/OverviewModel.php

I hope this helps but I don’t see a solution without having to code.