How do I open a PDF in a window?
Find the PDF in your Files and open it with a double-click. Select Adobe Acrobat (or your preferred PDF reader) from the list of available options. If an options window doesn't appear, or if the PDF opens in another program, go back to the File view and right-click on the PDF.
Can you force a PDF to open in browser?
Right click on any PDF file you've downloaded. Click Get Info. Click Open With. Choose Google Chrome from your list.