Can´t edit the style of one individual line

Hello there, I am trying to edit just one line in OfficeDraw, to make it a dotted one instead of a continuous one.
When I select the ‘‘edit style’’ window, and change the style, some of the other lines also become dotted.
No matter what I do or if I try drawing more lines, it seems impossible to change the style of just one individually, it always affects others.
Any help?
Thanks in advance.

What do you mean by “just one line”?
Is it the line property of any drawing object (like a circle)? OR
Do you want to change the style for one of the (e.g.) 4 edges of the border around a rectangle? OR
Are you talking of one of the lines occurring in a sequence defining a polygon? OR

If this isn’t completely clear to you, you may look into this example:
disask70234SpecialLineStylesInShapesProbablyNeedingGrouping.odg (13.8 KB)
.Make sure to see the defined styles in the Stylist (F11 by default). Also open the subtrees Graphic and Shapes for the purpose.
Also enter the groups to see more details.

…it seems impossible to change the style of just one individually, it always affects others.

Yes, and that is the right thing to do for systemic reasons.

You need to create a new style!

Right-click in the Sidebar ( Ctrl + F5 ) on “Default Drawing Style” and select New....

Enter a name for the new style in the “Graphic Styles” dialog.

In the “Line” tab, select the desired line style and possibly a different color and line width.

Click OK.

Select the line you want to have different and double-click the new style.