Filter to decide if sharing buttons should be displayed.
sharing_show
sharing_show-
filter -
filter sharing_show_buttons_on_row_startFilters the HTML at the beginning of the “Show button on” row.
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filter sharing_show_buttons_on_row_endFilters the HTML at the end of the “Show button on” row.
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action pre_admin_screen_sharingFires at the top of the admin sharing settings screen.
Jetpack Developer Resources 