Is there a way to prevent boundary symbols from being hidden?

[gitsang]

I wan’t it render but don't hide. Is there any way to implement it?

Anti-conceal is only a cursor row based. But what I want is the global anti-conceal.

[gitsang]

set rendered = 0

   win_options = {
        conceallevel = {
            rendered = 0,
        },
    }

[MeanderingProgrammer]

You can do that, but that will impact how a lot of things are rendered, like tables and checkboxes for example. Without the ability to conceal text (which is what conceallevel = 0 does) many other things will render poorly.

Instead I would update your highlights to not conceal elements you don't want to be hidden. The highlights likely come from nvim-treesitter and can be overridden by you.

For example to keep backticks around code blocks copy this file: https://github.com/nvim-treesitter/nvim-treesitter/blob/master/queries/markdown_inline/highlights.scm to your local directory at: <config_root>/queries/markdown_inline/highlights.scm and remove the bit that hides the code delimiters.

That means replace this part:

; Conceal codeblock and text style markers
([
  (code_span_delimiter)
  (emphasis_delimiter)
] @conceal
  (#set! conceal ""))

With:

; Conceal text style markers
((emphasis_delimiter) @conceal
  (#set! conceal ""))

The code_span_delimiter is what defines the backtick for code blocks. You can similarly apply this to any other elements you don't want to be hidden.

You can do the same thing for the main markdown highlights which are defined here: https://github.com/nvim-treesitter/nvim-treesitter/blob/master/queries/markdown/highlights.scm