Limit to total videos displayed on User Feed?

Hi,

When using the ‘user feed’ option, it only seems to display a maximum of 12 vids. Would this be potentially my theme (customizr) that’s doing this or something in this plugin?

the link is: https://www.solentmusic.co.uk/student

thanks a lot

https://www.ads-software.com/plugins/youtube-simplegallery/