I am working with couple big shapes on my document, and some of them are so big that they out of my document borders. It is quite annoyes me because I always looking at my work and when I see thing I dont need outside working area is disturbes mes. What to do so I could hide them ?
Yes, the shapes will still be there after reopening. Normally that's how you would want them, because then you can change them easily.
But if you really want to cut them, there's no easy way to do so in Illustrator when strokes are concerned. So masking would basically be the way to go.
You can cut them (albeit with about twice the work required by drawing programs which provide a decent cutting tool):
1. Line Tool: ShiftDrag to draw a vertical line along the page edge, crossing all the paths you want to cut.
2. Black pointer: Select the line you drew and the lines you want to cut.
3. Shape Builder Tool: AltDrag across the unwanted portions.
4. Select and delete the vertical line.