[phossler]

In the OPF I noticed this meta:

<meta name="calibre:user_metadata:#formats" content="{&quot;is_custom&quot;: true, &quot;is_editable&quot;: true, &quot;link_column&quot;: &quot;value&quot;, &quot;rec_index&quot;: 22, &quot;label&quot;: &quot;formats&quot;, &quot;is_multiple&quot;: null, &quot;is_multiple2&quot;: {}, &quot;search_terms&quot;: [&quot;#formats&quot;], &quot;name&quot;: &quot;Books&quot;, &quot;category_sort&quot;: &quot;value&quot;, &quot;display&quot;: {&quot;contains_html&quot;: false, &quot;make_category&quot;: false, &quot;composite_template&quot;: &quot;{:'approximate_formats()'}&quot;, &quot;composite_sort&quot;: &quot;text&quot;, &quot;use_decorations&quot;: 0}, &quot;kind&quot;: &quot;field&quot;, &quot;#value#&quot;: &quot;AZW3,EPUB&quot;, &quot;is_category&quot;: false, &quot;column&quot;: &quot;value&quot;, &quot;is_csp&quot;: false, &quot;#extra#&quot;: null, &quot;datatype&quot;: &quot;composite&quot;, &quot;table&quot;: &quot;custom_column_2&quot;, &quot;colnum&quot;: 2}"/>

Even when I delete it, it seems to come back after I launch the editor from Calibre.

It doesn't seem to hurt anything, but it appears to relate to Calibre options, so I was wondering what it's for