Open Launcher - App names not displayed in groups

I use Open Launcher and when i group app icons, i can give a name to the group but app names inside the group are not displayed.

Apps do have names because i can see it if i long press the app icon, but it is not displayed though.

Did anyone already face this issue?

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I answer to myself, in case it can help someone…
Actually the app names font color is white on a white background!
In the Open Launcher settings, it is possible to modify the background color of the groups, and so select an appropriate color.
A nice improvement of Open Launcher would be to add a setting to modify the font color of the app name.