I do use occasionally the searchable custom column link named "Filter Formats" on Book Details.
To differentiate between that and the built-in one that has the click-to-view formats links, besides the distinct heading name, I've added a bold styling to the latter, so it looks like this:
The CSS I have currently in Preferences -> Look and Feel -> Book Details
PHP Code:
#formats a {/*color:orange;*/ font-weight: bold; font-size: 11px !important;}
In the past I had used also a different color for that distinction, but now I leave this styling bit commented and use different colors just for tags and title:
PHP Code:
#title { /* font-size: 12px !important;*/
color:orange !important; font-weight: bold; }
#tags, #tags a {color:#F578BE; /*font-weight: bold;*/}
BTW, the custom Filter Formats column is populated this way:
