Hmm. If I type into Project Info in the file that Derrek uploaded, it works absolutely fine.
Is it possible that along the way you’ve created more overrides for yourself? For clarity: when you create an override, Dorico locks down the text frames (the green ones indicated above) for manual editing only. It basically unlinks a load of stuff that should ideally remain linked.
The good news is that in Elements there’s not much you can do that is specific to a layout. I suspect that the quickest way for you to rescue the file itself would be to fire up Layout Options, select whichever layout you’re currently working in in the right side of the dialog, then at the bottom left switch the Part/Score dropdown to whatever type of layout you’re using, then click Save As Default. Then Close Layout Options.
Now, in Setup mode, bottom of the right panel, create a new layout (of whatever kind you’ve been working in) - probably a Full Score. Now select and delete the old Full Score layout (which will be at the top of the right panel of Setup mode) and start working with the new Full Score Layout, which will have all the same Layout Options as your previous layout but with none of the overrides.