I use auctex/reftex with pdftools for preview. I use a vertical split C-x 3 of the emacs frame with the left buffer being the pdf preview and the right buffer being the latex file. When I invoke reftex select buffer with keystrokes C-c ) the reftex buffer and latex buffer take the entire frame hiding the pdf preview. Is it possible to customize the reftex select buffer so that: (i) it appears only in the right half of the frame below my latex file and (ii) the reftex and latex buffers do not hide the pdf preview.
Looking at the code, this is not possible by default. However, you could easily modify the code to achieve it. For that, change the line:
(switch-to-buffer-other-window "*RefTeX Select*")
in the function
(select-window (display-buffer-below-selected (get-buffer-create "*RefTeX Select*") nil))
and similar for the subsequent created windows (the code contains useful comments for 'discovering' lines/functions that create new windows).
You might also submit a feature request to make it customizable (e.g. by using the function
display-buffer-in-direction) to the bug-gnu-emacs mailing list.