‘fillchars’ ‘fcs’ string (default “vert:|,fold:-,eob:~“)

Characters to fill the statuslines, vertical separators and special lines in the window. It is a comma-separated list of items. Each item has a name, a colon and the value of that item:

item name default Used for stl ’ ’ statusline of the current window stlnc ’ ’ statusline of the non-current windows vert ’|’ vertical separators :vsplit fold ’-’ filling ‘foldtext’ foldopen ’-’ mark the beginning of a fold foldclose ’+’ show a closed fold foldsep ’|’ open fold middle character diff ’-’ deleted lines of the ‘diff’ option eob ’~’ empty lines below the end of a buffer lastline ’@’ ‘display’ contains lastline/truncate

Any one that is omitted will fall back to the default.

Example: :set fillchars=stl:\ ,stlnc:\ ,vert:|,fold:-,diff:-