I'm surprised that I can not find an answer to this one. Is there any way to restore a specific add-on's preference states to the defaults?

I would prefer not to uninstall the add-on if possible.


You can create an Operator and make it part of the Preferences layout for your custom add-on:

class MyAddonPreferences(bpy.types.AddonPreferences):

    bl_idname = __name__

    display_flag: bpy.props.BoolProperty(
            name="Display Flag",
            default = True)

    def draw(self, context):

Best practice is using property_unset(property):

class MYADDON_OT_resetPreferences(bpy.types.Operator):
    """ Reset Add-on Preferences """
    bl_idname = "my_addon.reset_preferences"
    bl_label = "Reset Properties and Settings"
    bl_options = {"INTERNAL"}

    def execute(self, context):
        prefs = context.preferences.addons[__name__].preferences
        return {'FINISHED'}

In order to reset the properties of a certain add-on it's basically the same, you just need to find a way getting the name of each property.

Example on how to reset the settings of Loop Tools by reading its annotations using the Console:

>>> prefs = C.preferences.addons['mesh_looptools'].preferences
>>> props = prefs.__annotations__.keys()
>>> for p in props:
...     prefs.property_unset(p)
  • $\begingroup$ So essentially call property_unset() for each preference variable? This is really useful, thank you. What about from a user's perspective - a user wanting to clear an add-on's preferences without scripting? I haven't experimented much with this, but how would they usually go about doing this? Is there a folder or file where these settings are saved per-project? Thanks again! $\endgroup$ – Robert Sep 16 '19 at 17:34
  • $\begingroup$ There is no generic option for the user atm, you have to provide that @Robert $\endgroup$ – brockmann Sep 16 '19 at 18:17

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