Insert > Media > Photo Album is very useful for inserting many pictures into slides - a picture to a slide.
It fills each slide with a picture, often leaving no room for a caption.
Insert > Media > Photo Album has a checkbox option to include a caption are on each slide, however that is semi-transparent and partly blocks the bottom part of pictures.
A. How can such automatically created caption areas be defined for all slides to be totally transparent, invisible background so only the caption text shows? The text would still cover part of the pictures.
B. Is there a way to define a master slide with two frames: one for the photos and on the bottom a text box for captions and have Insert > Media > Photo Album insert pictures only within the photos frame?
C. If option “B” is not possible then is there a way to define a master slide with two frames as in “B” and after Insert > Media > Photo Album inserts pictures taking up much of the space of each slide resize each inserted pictures in one operation to be reduced by a certain percent and top aligned?
PARTIAL WORKAROUND: If I open a LibreOffice presentation in OpenOffice I can click on the text box, then on Area. It has a Transparence tab. Setting transparency to 100% makes the text box background transparent. Of course the text still covers the picture. I succeeded doing the same in LibreOffice, but in general it is difficult to get to see the Area option.
The workaround has to be repeated for every slide and not done once as default for all slides.