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The easiest way is of course to use the select tool cursor to box everything on screen and change the line colour.
The other way is to change the default styles. (Format > Style)
You may not be able to change all of the line types at once, but you may change them once and save it as a profile for future use.
Hope this helps a little.
The best way is to create a NEW line style and do as follows:
Select Format>Style, the Style Dialog box will appear then Choose NEW give it a name "Visible Red" based on "Visible" and from the ‘General’ tab set the colors and then Close the new linestyle. Now Select the Drawing View properties (RMB) 'Display'tab and select the "Visible Red" in the dropdown list.
Later in assemblies you can give individual parts a different color.