QTextEdit font problem

[MortyMars]

Hello everyone,

Sorry for this beginner's question, but I can't seem to restore the font of some 'QTextEdit' to their default appearance.
I've tried changing a whole bunch of parameters, but nothing seems to work.

The lines marked with a red 'No' are the wrong ones.
And the ones marked with a green 'Yes' are the ones with the desired result.

Thanks for your help.

[jsulm]

Sorry, but this is not enough information.
You did not tell how and what exactly you changed and how you're trying to change it back.

[MortyMars]

Thank you @jsulm for your help.

In fact I didn't know how this shaping takes place without me changing anything, consciously anyway.
And as a result, I didn't know how to get rid of it and go back to the default situation.
I'm the one who's sorry I didn't explain the situation clearly...

However, I've found a solution, which is probably not very academic but which is proving effective.
When I see a QTextEdit with the unwanted formatting :

1. I open the editor (by double-clicking)
2. I switch to ‘source'
3. I select the contents of the window
4. I delete everything
5. I confirm with 'OK

Now I have a 'reset' QTextEdit