Hi,
this is possible but not doable with the UI of Designer.
The workaround is as follows:
1. Create a text, enter your default text with all the formattings you need (text color, bold text, line breaks etc.)
2. Create a text field and enter any word as default value. Let's say "Default".
3. Select the text and the switch to the XML Source view.
There you will find all the formatted text between the <value> tags such as:
<value>
<exData contentType="text/html">
<body xmlns="http://www.w3.org/1999/xhtml" xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/"><p style="letter-spacing:0in">This is<span style="xfa-spacerun:yes"> </span></p><p style="color:#ff0000;letter-spacing:0in">default Text</p><p style="letter-spacing:0in"><span style="xfa-spacerun:yes"> </span>• with<span style="xfa-spacerun:yes"> </span><span style="font-weight:bold">RichText</span> formatting.</p></body>
</exData>
</value>
4. Select the whole code between the <value> tags and copy it to the clipboard (ctrl + c).
5. Go to the Design View, select the text field, go back to the XML Source view.
6. There you'll also find the value <tags> and your default value you entered before.
<value>
<text>Default</text>
</value>
7. Select this code section and paste the value copied before to the clipboard by pressing ctrl + v.
8. That's it. When you now go back to the Design View your text field shows a formatted RichText as defaul text.
