How to zoom in on the crossbow

I believe all killing methods result in increased chaos. Since there are apparently non-lethal methods for disposing of your main targets, this might include them. Note that if you use non-lethal methods to dispose of guards and the like, rat swarms can still devour bodies and this might count towards increasing chaos (or missing achievements). There are "safe" places to dispose of bodies (like garbage containers). Elevated surfaces can also be safe, but if a body is not in a garbage bin there is a chance it will show up as "found" at the end of a mission (as near as I can tell). Generally I think sticking bodies on tables in isolated rooms is safe.

Also, see this PCGamer article. Highlights:

1. If you get a high chaos rating it can be brought down but it can take a few missions.

2. Bethesda says that if you maintain a <=20% kill ratio you should stay in low chaos.

3. Most creatures don't count towards the chaos total but Weepers do.

4. Re-wired trap kills and dumping unconscious bodies into water or dropping them from a great height count.

You can't see it in the menu or anywhere else. The only things you see is:

• If you find one collectable, it will display your total amount of collectables from this type in the bottom line.
• If your done with the level, it will provide a summary of all found collectables and those which could be found in the level.

But you can take a look at a list of collectables per level to get the info early enough and just remember how much you already found in a specific level. Such a list can be found here.