Imagine I have some bus lines each with a different colour, and sometimes the different bus lines run on the same road, but I don't want one of them to disappear.
Is it possible to make them show as parallel like in the picture?
If I just simply draw the lines in parallel to each other, they will change appearance a lot as a zoom in or out and I would not have a consistent width between them.
You can add a property "offset" to each line segment, draw the lines on top of each others and then apply an offset based on the recorded value.
This way, the offset can be maintained as you zoom in or out, and you have more flexibility than a fully automated solution to make it look good.
In the example below, the same line was copy-pasted 5 times, with a field named offset having the values -2, -1, 0 , 1, 2.
To the right of the offset setting, click the little epsilon symbol, choose edit and just write the field name (here, offset) and eventually a multiplier. Make sure the unit remains millimeters or pixels but not map units
