Steps to Reproduce:
File for testing:
KUS001 - Check Kqlmagic installation.txt

The workaround is for users to always remember to use Split View or Markdown mode. But because the default mode is Rich Text view, this will significantly impact users with files where text cells have relative paths.
@barbaravaldez - Not sure if this is related to https://github.com/microsoft/azuredatastudio/pull/12802. Could you take a look at this?
Note: I see this behavior in RC1. Also, it seems that it's affecting those paths with "%20" as show on the sample file.
Exhibit 1 - For paths with "%20"
* [KUS002 - Querying internal Kusto clusters with Kqlmagic](.\KUS002%20-%20Querying%20internal%20Kusto%20clusters%20with%20Kqlmagic.ipynb) will become [KUS002 - Querying internal Kusto clusters with Kqlmagic]()
Exhibit 2 - For paths without "%20" (this is not on the sample file... I just modified to remove %20 to see what happened)
[KUS003 - Kqlmagic in ADS Demo](.\KUS003-Kqlmagic-in-ADS-Demo.ipynb) will become [KUS003 - Kqlmagic in ADS Demo](KUS003-Kqlmagic-in-ADS-Demo.ipynb) where .\ is removed.
I can help look into this as well as it seems to be a high priority WYSIWYG bug.
@VasuBhog Thanks - could you and @barbaravaldez sync up and work on this?
Hi, @MsSQLGirl I am only seeing the behavior when the .\ is removed after following the same steps (I am using a Mac). I do believe that this issue is focused on the windows path and the .\. I will continue to investigate with @barbaravaldez.

This is not a regression, as it also happens in the current stable version of ADS (September release).
Is there a setting to disable the rich text editing or make it not the default? I keep scrogging my files by editing them and not noticing that I'm in rich text mode.
Hi @sredman, yes you are able to uncheck the setting "Set Rich Text View By Default" in the settings. Therefore making your default for text cells be Markdown viewer instead.

Most helpful comment
Hi @sredman, yes you are able to uncheck the setting "Set Rich Text View By Default" in the settings. Therefore making your default for text cells be Markdown viewer instead.