RichTextBlock with outline string displays irregular spacing

We can see irregular spaces between string.

They want to display outline font bodys in regular spacing.
Or they want a checkbox option to change the behavior of the spacing.

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1. Create a databale which based on RichTextStyleRow
2. Create a WidgetBlueprint
3. Put RichTextBlock in the widgetBP
4. Assign datatabe to the richtextblock
5. Put some tags between the strings