microdave wrote:
I’m sure. I have settings as
https://discussions.apple.com/content/attachment/04073071-b23a-4c92-a981-8755485c2a6d
There is nothing under ‘general’ other than the background colour and nothing under ‘PDF' about opening the file. I can get the files opened as tabs within one window, but I still can’t look at two PDFs side-by-side, unless I export one tab by right-clicking on it.
I'm sorry, but what you describe goes against the design of the system, past behaviour, and current experience. It simply doesn't work that way.
In any document-based app like Preview. When you open a document, and then open another document, the new document appears on top of the previous window, offset down and to the right just enough to still have access to the previous window. You can open dozens of documents and see them laid out, sometimes staggered, across the screen.
Preview only seems to do this with PDF documents. Images behave differently. They open in the top, left corner, all on top of each other. In all cases, all windows are accessible via the Window menu.
There is some new auto-tiling behaviour in Sequoia. That can be confusing.
And there are bugs in those Preview settings from your screenshot. Sometimes it won't respect those settings.
But if I understand what you are saying, you are saying that it completely closes the previously open PDF document and opens a new PDF in its place. I've never seen that.
You could even try to force the issue. Open one PDF. Choose File > Duplicate. This will create a new document. You will not be able to manually close this document without choosing to either save or delete it. Try this and see what happens when you open a new document. Something's got to give in this case and that may be enlightening.
Another thing to try would be System Settings > Desktop & Dock > Close window when quitting an application = OFF
