Thanks for writing in! In the X theme we do have 4 stacks, namely the integrity, renew, icon and ethos. If you speak of page templates, we have 12 pages templates. It is best that you have to know the difference with this two first. Our knowledge base could give you more information about that. Please check that out here:
So if you want to remove the page title you say, you may need to edit the page and disabled the page title option which you can find in the Page Settings. For more details about this option, please check this out:
Hope this helps.