Hey @shayepm welcome to the forum.
The update above was only a UI change for controls and had no effect on the styles already applied.
Now I did look at the link you provided and display: flex is set on the All Paragraphs tag. This is affecting all paragraph elements on the site whether they are inside a Rich Text element or a stand alone block element.
To clear this, select a paragraph then in the Selector choose All Paragraphs and reset the Display property. Hope that helps.
