How to change the font of a dialog title

I have a few macro’s with dialogs in it. Changing the font settings of the dialog title does not seem to have any success.
How can I change it?

Which “title” do you mean? Title from the window will be changed by the window system you are using (Windows, Linux KDE, Linux gtk3 …).

The title of the dialog window itself. All the settings of that window can be changed in the settings, but changing the font settings does not seem to have any effect. (ubuntu)

Title in the dialog depends on gtk3-settings in your Ubuntu window system. It’s the same font with same height in all dialogs and windows of the system. Here with OpenSUSE and KDE it is set as Noto Sans 10pt.
Don’t know what the font settings should help, which could be found when clicking on a whole dialog in dialog editing of LibreOffice.

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Thank you, now I see. But it means that the font settings for the Dialog window in fact are useless.

Might be the settings will set the start value for controls which you will create in the dialog. But haven’t tested it.

No, I have just tested it on a newly added control

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