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Can the search form be used with a shortcode in templates versus the widget?

Insert search form in templates using the shortcode: [multisite_search_form]

How can show horizontal form using the shortcode?

Use type attribute to select vertical form or horizontal form. For example: [multisite_search_form type="horizontal"] Default attribute value is vertical.

How can change results page URI when you insert search form with the shortcode?

Use page attribute to change results page URI. For example: [multisite_search_form page="multisite-search"]. Search results will be showed in http://your_blog_URL/multisite-search. Default attribute value is globalsearch.

Can I put search form into PHP files using a function?

Yes, put this code into your files: Multisite_Global_Search::ms_global_search_vertical_form(your_results_page) or Multisite_Global_Search::ms_global_search_horizontal_form(your_results_page)

Get error "check you have create views privilege in your WordPress database. Illegal mix of collations for operation 'UNION'".

The instruction means that you may not have given the necessary priviledges to your MySQL user. The user needs to be assigned the ability to "create views".

Limit results to just the title and the excerpt

Edit results page and place [multisite_search_result excerpt="yes"] in the post content area instead of [multisite_search_result]

Set the plugin to always perform searches also in pages

Check option "Search by default on pages" when you configure Multisite Global Search Widget.

If you use shortcode [multisite_search_form] use search_on_pages attribute to search by default on pages. For example: [multisite_search_form search_on_pages="1"]. Default attribute value is 0.