@
owb - I don't know when, but my impression is that the click-ability of column values in Book Details changed fairly recently; from being Tag browser category columns, to being
most searchable columns.
There are some columns where, for me at least, being able to click a value has very little value, such as word counts, file sizes and precise timestamps. FX: the probability of there being more than one book in a library of 10,000 books with an ePub size of 112,407 bytes must be close to zero - and so what if there are two.
Why is Title Sort clickable but Title isn't?
My Book Details panel is a sea of blue

So, I'd quite like to see colours used to differentiate what a click will do: open a format file, initiate a library search, open a website in the default browser, open another program (e.g. OneNote), or link to another book or library via a calibre:// URL. I do colour the latter two, at an individual book level, would be good if I could do it in the column definition.
BR