Change default in the object properties docker. don't forget to save as default
once already existed dotted lines ... are not converted to line using this. this may be the initial one. but i get so many works outside, and they send most of them are dotted line
all the pages dotted to line is required.fine if you wirte a script sir
Select the whole graphic push F12 now in the Outline Pen Style Dialogue set the style to filled line. Works in 2018