Changes

\setuphead[chapter][header=high,footer=none] % with header=high the text area of the page will extend up % into the space where the header normaly sits% or:\setuphead[chapter][header=emptyhigh,footer=none]  % header=empty leaves the header area intact, % but does not fill it with any text\setuphead[chapter][header=empty,footer=none]

== Adding Substituting a line below the shorter lemma for a ''section'' header ==There are two ways Given a global setup such as <texcode>\setupheadertexts%[][section][chapter][]</texcode> Sometimes the ''section'' title is too long to achieve this:fit in the header. Instead of manually inserting a new \setupheadertexts comamnd you may use something like 

\setupbackgroundsstartsection [title={Here is a section title too long to fit in the header][text][bottomframe}, marking=on{Here is a section title}]

The above method will require the header=high option if Similarly, you want can send shorter lemmas to skip the line on pages where a chapter begins (with header=empty the line will still be there but with no text)table of contents or to bookmarks. The second method allows skipping the header (including So the line) with both the header={empty|high} option.relevant keys include