My Power BI desktop UI looks different from the last few days even though I did not upgrade anything to my knowledge.
Earlier, in the reports I created when I clicked on a Card and then went to Visualizations-> Fields-> Selected and expanded the query ->clicked on the calculated field the formula would be shown up at the bar on the Report screen.
Based on my test, I canot reproduce your issue here. Could you please try to restart your Power bi desktop to check again? BTW, it is always recommended to use the latest version of desktop. Please update it and have a try.
Community Support Team _ Frank If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.