In version 12 of both the Web Client and Forms, there is a new App Picker feature that is separately configured for each of these components. It would be great to have an option to import/export the App Picker configuration or even keep them synchronized, since they will likely have nearly identical settings.
It appears that you can manually edit the Web Client App Picker configuration using the JSON file located below, but I haven't tried it yet. I couldn't locate a similar file for Forms.
C:\Program Files\Laserfiche\Web Access\Web Files\Config\AppPickerConfig.json