https://www.ultimatebeaver.com/modules/row-separators/
Row Separators - Ultimate Addons for Beaver Builder
Row Separators We have applied a “Big Triangle” Separator to the bottom of this row. Interesting, isn't it? Let’s have a look at few more examples.. Wave Slide
row separatorsultimate addonsbeaverbuilder
https://gnome.pages.gitlab.gnome.org/gtk/gtk4/method.ColumnView.set_show_row_separators.html
Gtk.ColumnView.set_show_row_separators
gtksetshowrowseparators