I managed to delete all previous page numberings but it ook me more than 50 'delete' clicks (I suppose that was because of my document contain multiple sections)...

But now, before trying to renumber the pages of the whole document, I encounter another serious issue: Checking the document (86 Mo) and readjusting some faults I got error messages that Word reached the max size and had to close !!!... When I reopen the file and try to work out some corrections suddenly the total layout crimps on the left side of the page and becomes unusable ... even when I try to save my work I got the same faulty issue...
Please help me ; what can I do ?