Default theme in the latest version (26.5.10) no longer allows raw HTML in fields.
So for example, if you used HTML in your fields like this:
Now it will show as:
This is for security reasons because in multi-user environment restricted user could potentially inject malicious HTML tags or they could simply insert malformed HTML and ruin the layout.
If you want your view screens still support raw HTML, you will need to use custom theme. Either make your own custom theme to support raw HTML in fields or you can use pre-made one.
Here is how.
Go to Extensions tab:

Then click Custom Themes
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Find Raw HTML Theme

And click Install button

Now when you edit your invoice, quote, order or anything where you are using raw HTML, select this custom theme:

And now your raw HTML will be working:
You should really only use this custom theme when you can trust input of other users.





