Hi David,
By default, the "Description" field in the "Media Box" particle does not render shortcodes (for example the Regular Labs Slider).
Anyway, I modified the particle so it now renders shortcodes.
Here's what you need to do:
1. Download the attached
media-box-custom.zip file.
2. UNZIP it on your computer. You will find one file -
media-box.html.twig.
3. Copy the
media-box.html.twig file to
root/templates/TEMPLATE_DIR/custom/particles (if the
particles folder does not exist, you will need to create it manually). Basically, this step is the same as the one described in the
Overriding Particle Source Files section in the Gantry 5 Documentation.
4. Clear Joomla cache.