You will have to go into the HTML code (click the source code icon <>) to remove the extra </li> <li> at the end of the first indention and before the next indented line. Remove these two to get rid of the duplicate bullets on the first line of newly indented text.
Here is an example of the code using your example:
<ul>
<li><span style="font-size: 10pt;">When adding bullets...</span></li>
<li>
<ul>
<li><span style="font-size: 10pt;">and then doing indented bullets, it is....</span></li>
<li>and the next bullet on the same indent is fine and if adding yet another indent level</li>
<li>
<ul>
<li>it creates a square bullet symbol</li>
</ul>
I have bolded the items in the code you will need to remove to achieve the desired result:
- When adding bullets...
- and then doing indented bullets, it is....
- and the next bullet on the same indent is fine and if adding yet another indent level
- it creates a square bullet symbol
