It's hard to find because there are kinda two library folders, and if you go to the wrong one, the audiokinetic folder isn't there.
For me, I found it by going to Finder, then on the menu bar at the top click "GO", then in that dropdown select "Library"
A finder window will open up and your path is then Library/Application Support/Wwise2017
Delete that Wwise2017 folder
relaunch Wwise
You'll be prompted to reinstall the microsoft stuff, do so.
Wwise opens, click through any pop up windows, then open a project and the layouts will be back.
At least this worked for me!