What is the problem or goal you're trying to solve or accomplish?
Admins want to expose very large datasets (with multiple columns) and let end-users customize their view by removing/adding columns. The current column selector is hidden in the three ellipses, which is not super intuitive.
How are you solving it currently?
Admins need to instruct end users to rely on the column menu.
What is your recommended solution?
Provide a chart configuration to enable/disable the column selector sidebar already available in the AG Grid library via the Columns Tool Panel:
Enabling this option should also persist to the Embedded mode.