Editing columns in an existing table

How can we edit (add or delete) the options of a drop-down inside a column of an existing table?

Also, to add a new entry line, can the add button's location be changed to the top of the column (see below)?

If you are referring to selecting another option or removing a previously selected option, then just edit the submission.

How-to-edit-submissions-made-on-your-forms

However, if you are referring to modifying the actual options of a dropdown field, please note that one column in your Tables page corresponds to one field on your form, as such, to modify the options, please edit your Dropdown field within the Form Builder.

I was totally wrong trying to edit the columns directly on the table.
...

Hi,

Do you still need assistance?

You can edit the data in the Tables. Here's a screencast of my test:

thank you for the response! Problem solved!