What I suggest you is to first do a backup of your data, just in case. For this, you select your whole table, copy it, and then click on edit > paste special > paste values only. Now you saved it, you go back to your selected table and just press the Delete key of your computer keyboard. You're done!

How do I hide the editor of a pivot table?

However, at this point, there really is no way to hide the pivot table editor in Google Sheets from view. Every time you select a cell of your pivot table, the editor sidebar will appear, and there's not much that you can do other than to simply close it.

What is pivot table Editor?

Pivot tables help you summarize data, find patterns, and reorganize information. You can add pivot tables based on suggestions in Google Sheets or create them manually. After you create a pivot table, you can add and move data, add a filter, drill down to see details about a calculation, group data, and more.