Lock view focus and position only lock the view to the sheet and not the position of the moving component/s.
You could create a 2nd configuration of the position you would like the view but then revert back to the initial configuration giving you the ability to move the assembly as well
I would like to second Stephen's suggestion to use configurations. I would also like to suggest that you go ahead and use mates, even if it's lock mates, to fully define the position of the configuration you want to show in this drawing view. That would lessen the chances of accidentally moving the parts later and unintentionally changing the drawing view.
In addition to what Stephen & Glenn mentioned - Lock View Focus allows you to sketch within that view, something I use once in awhile depending if I want to add an additional line for dimensions etc... Just for a test lock the view focus and draw a line across one of the views and you will see the view box grow if you go beyond the part view...
I came across to your post, while looking for an answer which is related to this post.
In Solidworks Drafting Tools Exam - There was a question to create a Horizontal Dimension Between Line (Already Drawn) and Edge of An Assembly Front View and change the dimension , which should result in Changing the Line Length. How can we do that. Any Ideas?
I am not sure I can upload the drawing due to "Solidworks Terms of Exam"
Please note - I can dimension the edge to the line, by Locking view focus, but the dimension becomes the driven dimension, so I can not change the dimension hence Line Length can not be changed. There must be something I am missing.
Also I can draw a line at border and Make FIX relation and than dimension to the Line (Already Drawn), that way I can increase the Line Length.( I know it is very confusing to explain without uploading the drawing, but if somebody goes through the exam will understand what I mean)
Thank you very much gentlemen. That information is exactly what I needed.