This is vim session manager plugin. It's Can save, load and delete sessions.
ex: dein.vim
[[plugins]]
repo = 'skanehira/vsession'
" default is ~/.vim/sessions.
let g:vsession_path = '/to/your/path'
" default is 1
let g:vsession_save_last_on_leave = 0
" allowed values are 'quickpick' or 'fzf' or 'popup' or 'input'.
let g:vsession_ui = 'quickpick'
Also reference help.
" save the session.
:SaveSession
" load the session.
:LoadSession
" delete session.
:DeleteSession