My drawings do not get synchronized across all charts of the layout

The drawings can only be synced on charts with the same symbol within one multi-chart layout when you have the Drawings Synchronization enabled.

To enable synchronization of drawing objects, open the multichart mode in the Select Layout menu. 

Now turn on the synchronization of drawing objects using the button on the left panel.

You can also synchronize each specific drawing object by selecting the “Sync in layout” option in its context menu.