Hi @Kristina Suh
For your need, please refer to Andreas Killer's suggestion as a workaround.
Lock or Hide Permanently Field List from Pivot Table
- Make a new sheet
- Move the Pivot table into that sheet
- Disable the Gridlines on that sheet
- Be sure no filter is applied and so the max. size of the Pivot table is shown
- Select the whole Pivot table
- Use the Camera tool and make a snapshot
- Paste the snapshot into your original sheet
- Remove the border and the fill of the picture
- Hide the sheet with the Pivot table
- Protect your sheet as usual
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