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Vadym BombykVadym Bombyk 

Event object layout for managed package

Hi guys! I want to extend Event object page layout. I created few custom fields in Activity object and set field-level security for them (cuz I want that they will be visible in my layout). But I faced with problem: I want to add this layout to managed package, but this custom fields will be unvisible, so after installing my package System Administrator should do some manual settings (FLS) for fields visability. Question: How could I include this settings for this custom fields, so they will be visible in my Event layout (after installing package). 
PS. I know that page layout non-upgradable (https://developer.salesforce.com/docs/atlas.en-us.packagingGuide.meta/packagingGuide/packaging_packageable_components.htm).