In a lookup scenario where a user is asked to select more than one record from a standard list page, the user can mark the desired records using the select feature which sets the blue dots on the selected rows.

However, if the user has already previously made some selections, we need to make this visible to the user when the lookup is activated.

Unfortunately there is currently no way to set the blue dots from code; we can use the Mark method to select records behind the scene but this is not visible to the user the same way as it was in the old Nav versions.

Please provide a method that will allow us to trigger the visual selection on any page.

A suggestion could be to make it a method on the page, that would show marked records as selected when the page is opened, like Page.SelectMarked or Page.ShowMarkedAsSelected.