This is probably a simple problem to fix, but right now I am new to DMS concepts and therefore I'm stuck and can't seem to figure it out.
On my pages, the page titles are no longer showing up at the top of the page, as they did before. No problem for posts, where the post titles populate just fine. But when I try to make a change to pages, the templates for the entire site change as well, also altering post layouts. So for example, on one particular page I want to make it a full width (no sidebar) layout, but when I make the change on that page, all other pages and all blog posts now suddenly have no sidebar as well. Every time I try to start over by creating a new page from scratch, any change I make there also changes every other page/post. I know this has something to do with templates and how they are linked to posts/pages, but I cannot figure out how to unlink them or what else it could be.