@Mishal -

The only way I know to do this would be to do a backup of the board to a local file (from the export menu). That will give you a general idea as to its overall size. 

If you want to know how many objects there are, you can temporarily unlock all objects (by bringing up the pop-up menu in an unused “grey” area of the board), then do a select all and you’ll get a count of the objects. 

Kiron

Brilliant - thank you