I am interested to learn how to change the default course images in Moodle 3.6 It seems the default images are created on the fly using svg images (data:image/svg+xml ........) This does not make it easy/possible to change them? Below are two screen shots. Screen shot one is from our Moodle site. Note that I changed one already manually from within the course but want to change all for our entire site. Screen shot two is from a D2l (Brightspace) LMS.
Any help would be appreciated.