Change page background in LibreDraw

I am trying to change the background of the all pages in a pdf using LibreDraw in Debian 12 I follow these steps and I can do it for one page:
Open PDF > Page > Page Properties > Background > Color and then select and press OK However it's a 250 pages PDF and I need to apply this to all pages but it's not allowing me or I don't know how to do this for all pages. I tried selecting all pages before doing this step but it didn't work, and I searched online a lot but I found nothing. Please someone tell me how to do it with steps. Thanks in advance