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filter

gallery_widget_content_width

Allow the width of a gallery to be altered by themes or other code.

Parameters

$args
string

Display arguments including before_title, after_title, before_widget, and after_widget.

$instance
array

The settings for the particular instance of the widget.

self::DEFAULT_WIDTH
int

Default gallery width. Default is 265.

Changelog

How to use this hook

See “How to use actions and filters to customize Jetpack”.

Notes

You can use this filter to change the width of the Gallery Widget, like so: 
function jetpackcom_custom_gallery_content_width(){
	return 400;
}
add_filter( 'gallery_widget_content_width', 'jetpackcom_custom_gallery_content_width' );