Hello, I'm not a huge fan of the default triangular transitions between blocks

Here are some options i made using a paint program. First one is default/current behavior.
Second one just uses straight lines, third option uses separators between blocks
Is it possible to achieve number two or three?

See #773 or docs (Although the latter would do well with some clarification)
In my config I set the separator to a blank string to get your second example.
[theme]
name = "slick"
[theme.overrides]
separator = ""
aha thank you, that works.
@Dieterbe to answer your question in #377, here is relevant part of my config:
[theme]
name = "gruvbox-dark"
[theme.overrides]
# for pango markup see https://developer.gnome.org/pygtk/stable/pango-markup-language.html
# for possible separator symbols see https://github.com/ryanoasis/powerline-extra-symbols
separator = "<span size='large' font_family='TerminessTTF Nerf Dont Mono' stretch='ultraexpanded'>\ue0c7</span>"
Most helpful comment
@Dieterbe to answer your question in #377, here is relevant part of my config: