Show excerpt in Thumbnail layout

I like the Thumbnail layout, but want to include the excerpt.
Tried adding excerpt_show="true" excerpt_lenght="35"
But didn’t work. How can I do this?

[lptw_recentposts layout="thumbnail" width="500" columns="1" posts_per_page="5" no_thumbnails="show" show_date_before_title="false" show_date="false" show_time="false" show_time_before="false" background_color="#c4c4c4" ignore_more_tag="false" read_more_show="false" read_more_inline="true" read_more_content="Read more →"]

Heres my webpage https://klac23.org.au/wordpress/?page_id=3164

https://www.ads-software.com/plugins/advanced-recent-posts/