Select / Remove column(s) by column names.
Click "+" button and select "Select".
You can also select "select (Remove) Columns" from column menu of the columns that you want to keep (or drop).
Select "Include" or "Exclude" depending on whether you are selecting (Include) or removing (Exclude) columns.
Click the column you want to select/remove. You can use Control + Click or Sift + Click to select multiple columns.