Single-pane preview
This snippet allows single-click previews with only one pane visible:
nnoremap <silent> w : if &quickview && !layoutis('only')
\| view
\| else
\| if layoutis('only')
\| if &lines + 50 < &columns | vsplit | else | split | endif
\| endif
\| view!
\| execute 'qnoremap w q:view|only|qunmap w<lt>cr>'
\| execute 'wincmd w'
\| endif
\| <cr>
Context: https://q2a.vifm.info/803/file-preview-when-in-the-single-pane-mode