Change padding to text indent in “Increase indent” TinyMCE

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You need to modify the TinyMCE settings object on instantiation:

Reference: TinyMCE documentation – content formatting

WordPress provides a filter for this very purpose called tiny_mce_before_init which you can use as follows:

function modify_tinymce_settings($settings) {

    $settings['indentation'] = '10px';

    return $settings;
}

add_filter('tiny_mce_before_init', 'modify_tinymce_settings');

If that does not work precisely, then dump the output of $settings in the hook above to see where values for indentation are held, they may be nested as part of a multi-dimensional array.

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