Open the design in Fusion 360
Go to the Solid workspace
Select the bodies or components you want to thicken
Click Modify
Choose Thicken
Select the wall faces or...
Open your design in Fusion 360
Go to the Design workspace
Use the Manufacture workspace if you need a machining-oriented cut list
Use the Sheet Metal workspace...
Open the design in Fusion 360
Go to the workspace where the model is created
Click Create
Select Mirror
Choose the mirror type:
Features
Bodies
Components
Select the object to mirror
Select the...
Open the Manufacturing workspace
Select the Lathe setup
In the Browser, right-click the roughing toolpath
Choose Edit
Go to the Passes tab
Increase the Stock to Leave or adjust...
Open the design in Fusion 360
Go to the Solid workspace
Click Create
Select Mirror
Choose the mirror type:
Bodies
Features
Components
Select the body, feature, or component to mirror
Select the mirror...
Open the design in Fusion 360
Select the body or face you want to thicken
Go to Modify
Click Thicken
Select the surface or face
Enter the thickness value
Choose...
Open Fusion 360
Click your profile icon in the top-right corner
Select Preferences
Go to the General tab
Find the Theme setting
Choose Dark or Light
Click Apply or OK
Restart...