[Therion] XVI with sketch

Hello I am used thconfig like this: ----- input "large_centerline_with_loops_closure.th" input "new_survey.th2" # sketches enabled select new_survey.whole_cave export map -fmt xvi -o new_survey.xvi -proj plan -layout-sketches on ----- Therion generated XVI of "new_survey", but without sketch image. If I deleting "select" command I get XVI+sketch, but XVI contained centerline of whole cave (approx 30 km), and XTherion work very slow. How to make XVI with sketch for part of large centerline? PS using Therion 5.2.14 -- WBR, Vasily