Power Query Web – Enable column selection UI for Table.ExpandTableColumn (like in Power BI Desktop)

Description:
In Power Query Web, there's no graphical interface to edit the Table.ExpandTableColumn step — unlike in Power BI Desktop, where a gear icon lets users easily select or change the expanded columns. I propose adding the same feature in the web version to allow users to select columns without manually editing M code.

Benefits:

• Consistent experience between Desktop and Web
• Easier use for non-technical users
• Fewer errors and improved workflow efficiency