thank a lot you for your answer.
I'm going to describe the current behaviour
when I select a text file and press enter, it opens in the same window as VIFM and I can't use VIFM until I close the VIM file.
I am looking for a way to open the VIM file in a new window so that I can continue to use VIFM and possibly open other files.
I've tried the code you provided me, when I press "e" on the file it reads the text file in VIFM in the half pane and I can exit this view with pressing "q" - it's a cool think too
nnoremap \e :!xterm -e vim %c &<cr>