Okay, I'll check the links and get back to you if I have a problem.
Otherwise, can you tell me how I can write text in color diagonally on the page?
Finally, I can no longer insert my JPEG images into the page, it looks like this... funny, I was working with it yesterday afternoon without any problems!!!!
Either the options are not well chosen (see the screenshot) or the images are linked and have been moved (If they are linked, they must remain in the same directory as the document). or there are too many of them. (Inserting numerous images: https://forum.openoffice.org/fr/forum/viewtopic.php?p=211369#p211369) This is on OpenOffice but the principle is the same on LibO.