Bullet color in Robohelp 2020 version.

I should have added to click in your list and then go to Styles. You should be able to edit your list style in the same way.

As @Amebr has pointed out, this will affect all lists using that style. You could duplicate the style and then apply the appropriate style to different lists if that is an issue.

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

@Amebr is right that there are ifs and buts. However, at it's simplest...

This is a list created from the first option on the Bullet toolbar as shown in the Styles.

Click the pencil icon shown above to get to this screen. Tick the Advanced formatting check box to see the additional options shown here.

Make sure that Apply Styling To is showing Bullets and then change the colour under Font.

Be wary of changing the margins, font-size and so on as that can be more tricky.

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

Can you post some sample code for your list? It depends somewhat on how you are creating your lists. Also, do you want this colouring to apply for all unordered lists in your project or only some?