Hi William,
Thank you for your reply and suggestions to fix this issue.
- Worksheet protection: there was no protection.
- Worksheet group selection: no worksheets were selected.
- Partial table data: as clearly shown in the screenshots I provided, there was no partial table data.
- External data source: there are none in my workbook.
Your suggestion to fix the issue by converting the table to a range and then back to a table works.
However, I found an alternative approach without requiring table conversion.
I turned on the filter for each table using the filter button under the Data tab. Then I went back to the Table Design tab and unchecked the filter button for each table. This seemed to resolve the problem. I was able to go back to those tables this morning, and the filter button under the Table Design tab remained enabled.