Merchant tap

I would like to report an issue regarding the Merchant tab. I changed from Stash tab (pre-purchased 6 pages) to the Merchant tab with 6 pages. I didn’t know that switching would change everything to Manage Shop. I thought I could still list items for sale directly from the Stash tab. As a result, my storage space for items became reduced. I would like to get my Stash tab pages back. Is it possible to revert the change?