Saving file as a pdf booket

I have created a booklet in Coreldraw Home & Student 2018. It can be seen at https://www.dorsetbutterflies.com/about/branch-newsletters/ - look at edition 94. I can print the booklet out on my printer as a booklet, but I’ve been asked to put a pdf on the website which will enable people to print it out in leaflet format for themselves and I can’t figure out how to do it – the current pdf is in single page order, suitable for reading on screen.