I have not tried this myself yet, but I've been tempted to try it a few times because camera bounce is one of my top annoyances when building in this game. The camera bounce supposedly has something to do with the 'IgnoreLotLevel' setting in the camera.ini file according to Mustikkapensas on a thread about this issue at Answers.EA.com. Here's what they say:
"You can disable the camera drift for some degree from the game files. I don't have the DLC so I don't know if it'll work there but you can try.
Locate you game folder (can be found in Origin > App. settings > Install & Saves > Game library location) go to \The Sims 4\Game\Bin\res and edit Camera.ini with any text editor. Find every "IgnoreLotLevel" (without quotes) and change them all to true and save.
Only drift I could see after that was on foundation level for some reason but it's barely even noticeable. Hope this helps."Source: Camera bouncing uncontrollablyI guess it's worth a try if you're not afraid of possibly messing up your game. Could always copy the camera.ini file's original contents first and copy them back if needed. I just haven't reached the straw that broke the Llama's back yet. If you get my drift. No pun intended! :)
