In the past I have spoken about how, as these little stitched notebooks fill up it becomes harder to work on the pages which follow as the embroidered pages don't lay flat once they are filled with stitch, buttons etc.
I think that is explained a little in this post.
Usually I either tie the pages back with ribbon or create a long wrap to lay over those heavier pages to ensure they stay in place whilst I continue to work on the book.
This time though I made a 'sleeve', a patchwork sleeve which slips over the already worked pages, securing them temporarily.