line weights in vector and technical views

[Douglas49]

Hi

I appear to be missing something re setting up lines weights, especially for vector, technical and elevation views, 
The default settings I have bring up quite a heavy line whereas the ideal is a much finer line. I've seen this in HD and CA videos so I understand it can be done. 
I see one can change the line weights in the layer display options, but which ones do I change and to what setting for these views?

I've read up on it in HD help, but can't spot the solution.
I have attached an example to try and communicate what I'm saying - how does one reduce the line weight to a nice fine line?
Regards

Doug

HD Elevation.pdf

HD Technical Illustration.pdf

[solver]

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[Douglas49]

Thanks Eric

I've had a good look through all those resources (which are very helpful) and read up on this particular issue, but can't get it working for me.

File attached

Using HD Pro 2018 - should be on my signature now

35 Maioro sketch 2.plan