how do i get new tab on the right

[proj964]

I looked for an option to have new tabs open on the right side of the tab bar (like it used to).

[amanda_liang]

proj964 Is it mean that you wanna to open all PDF files in the same window? If yes, can you please turn off option "Allow multiples instances" in Preference? Finally, please restart Foxit and open any PDF file to see result.
(File menu>Preference>Document>turn off option "Allow multiples instances")
Thanks.