How to change decimal point to percentage in a pie chart

How to change decimal point to percentage in a pie chart,I didn't find the settings button

I find the field type of num is category, but the raw data is interger. How can I change the field type in metabase?

Why Metabse will change the filed type automatically ?which result in all pie charts to display abnormally.

You can change the field type for the column in "Admin Settings -> Table Metadata", choose the table you want and then modify the "Type" for the field in question. Once you update it the "Type" should be sticky.

I believe what you're seeing is this behavior where Metabase assumes the "Category" type for columns with low cardinality:

Please let me know if this resolves your issue.