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 always have the latest drawings on the other charts of this layout, you need to always stay on the multi-chart layout and must not switch to a single-chart layout. If you need to switch to one particular chart, please use the Toggle Maximize instead.

If you have already added drawings without following the above-mentioned steps, but would like to synchronize them across the other charts of this layout, you may open the Object Tree, multi-select the drawings (hold Shift/Ctrl and click on them), right-click on any of the selected drawings and un-tick and tick back  "Sync to all charts".