Hello @Hassan ,
Welcome to Microsoft Q&A forum.
You may need to select the corresponding Display items
and set it/them to Bold.
I tested on my side to check Bold option in Display items for Plain Text, as you can see, the following screenshot, the Plain Text in a normal .txt file displays correctly(note: this Plain Text
item only works for Plain Text, not C#, VB… codes).
Best Regards,
Tianyu
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