How to limit Expanded Search (plugin) query results for pagination?
This was solved in my latest release: https://github.com/mustasj/expanded-search/releases

So if you want to use it with pagination, you can now add limit and offset to the settings param.

So in your case the top of your template would look something like this:

{% set limit = 10 %}
{% set entries = craft.entries()
    .search(searchQuery)
    .orderBy('score')
    .limit(limit) %}

{# Paginate the entries #}
{% paginate entries as pageInfo, pageEntries %}
{% set expandedResults = craft.expandedSearch.search(searchQuery, {
    length: 155,
    offset: (pageInfo.currentPage - 1) * limit,
    limit: limit
}) %}