Visibilty (Hide an Item)

Develop an item formatting property which allows to set the visibility of a report item when you want to conditionally hide the item based on a report parameter or some other expression that you specify (also DAX expressions).

You can develop this incrementally starting from visuals, then text boxes, then shapes and buttons....

If you want to go the extra mile, you can also develop a functionality that allows the final user to toggle the visibility of report items.

For more information and since it was an available and really useful capability see "Add an Expand or Collapse Action to an Item (Report Builder and SSRS)".

https://docs.microsoft.com/en-us/sql/reporting-services/report-builder/hide-an-item-report-builder-and-ssrs?view=sql-server-2017

I double checked in the ideas database and there are many ideas describing the same functionality; this is the reason why I do believe this is really required and will try to collect all the previous votes under this item.