Lines and Arrows
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Here is a pointer from the Scribus Archives about customizing the relationship between line thickness and arrow size.
|If you use the automatic adjustments in Properties > Line tab, you will see that after you assign an arrow style, adjustments in line thickness cause an automatic change in arrowhead size, illustrated here:|
It's entirely possible that this size ratio doesn't suit you, so here is how to modify this behavior. First, adjust your line thickness so that the arrowhead size is correct. Now, create a line style, Edit > Line Styles (in 1.3.x, this will be in the new Styles Manager, Edit > Styles, then select New > Line Style).