Determining usage of a new column and/or measure

[Jeff2Jets]

I have been learning Power BI and in doing so, have created a slew of new columns and measures. Most of those I have used in Pages, but I am now in clean-up mode. I want to delete all unused columns/measures I have created, but I don't want to adversely impact any Pages that might be using them. 

Is there a way to see if manually created columns/measures are being used on any Page?

[lbendlin]

yes, but they involve disecting the .PBIX file and parsing the JSON.  Not something you want to do as a beginner.