I wonder if you are using a current version of Fusion. You Preferences dialog is not the same as the latest version. I am using Fusion 2.0.19426 and the setting for Associative Edit in Place is under the Designs > Assemblies index listing. Go to your Help icon in the upper right corner of the Fusion screen and click on the About icon to check your version.
Also, from the look of your Edit in Place bar at the top, it seems as this model has been edited before and was made Non-Associative. Once the Edit in Place is made Non-Associative and saved, it cannot be changed.

John Hackney, Retired
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