Disable auto-save or change frequency

I ended up here coming from threads about locking the editing view, after realizing that autosave is the real problem I’m having. I’m currently learning Obsidian and autosave is constantly messing up things for me. I’d love to be able do Ctrl+save a file at some point. Do a bunch of stuff to it and then, if I screwed up, simply close, then open the note again and be back to the last saved stage of my work. Or if this isn’t possible, at list, to have an option to lock a note that i’m done working on. Ideally locking the actual content, not only the view mode. Because I would often want to see source code of the note as a reference, while not being able to destroy it. In fact I’d really, really appreciate both options. Right now I’m kind of scared to use Obsidian at all, and especially for any topic particularly significant for me.