marleyman Hi
Try add this to custom.css file and adjust height value accordingly:
.s5_wrap_fmfullwidth{height: 200px !important;}
Finding custom.css or you may create a new file with similar name (if it doesnt exist) ::
Shape 5 templates ship with an empty custom.css file in the /css/ subdirectory of your template. Simply add your styles to this file and they will be included in your layout.
Kindly ensure to clear your browser cache if changes dont reflect