How can I change Filter Mask in Highlighter Settings / Filter?
You can’t modify the Filter Mask in Highlighter Settings / Filter for the User highlighters (bold font). Other highlighters are editable there. User highlighter Filter Mask you can edit in Tools / User highlighter If you are looking at a User Highlighter (bold font), then you must edit the File Filter mask in: menu Tools / User Highlighter / File types, comma delimited. However, all the others can be edited in Tools / Highlighter Settings. (Why?