To turn off a large number of Hidden Lines in a single part view see attached.
The trick is to click on the Layer box three times (don't ask me why).
Notice that I preserve the hidden lines on the holes to the left while hidding the rest.
The method shown is for easy to window or crossing window select. If the wanted lines are close to unwanted lines then select all to hide all of them. Then right mouse button to show hidden edges and select only the ones you want and then right mouse button Done.
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