VisualizeZeroWidthChars is a Sublime Text 3 plugin which indicates locations of zero-width chars by default.
You are able to indicate more chars by adding them in the settings file.
Can you tell me where are zero-width spaces?
If you are using Sublime Text 4, you can set draw_unicode_white_space to draw invisible Unicode whitespace.
In that case, you probably don't need this plugin and hence I deprecate it.
This plugin is available on Package Control by the name of VisualizeZeroWidthChars.
Note that this plugin only supports ST >= 3118 because of Phantom API.
💡 You may also be interested in my other plugins: https://packagecontrol.io/search/jfcherng
To edit settings, go to Preferences » Package Settings » VisualizeZeroWidthChars » Settings.
I think the settings file is self-explanatory. But if you still have questions, feel free to open an issue.