This is the default border, it looks ugly
This is fzf preview window, how I can replace the popup border as fzf's ?
Update: thank @ralf ! it works !
I replace it with...
Rounded:
['─', '│', '─', '│', '╭', '╮', '╯', '╰'],
Sharp:
['─', '│', '─', '│', '┌', '┐', '┘', '└'],