With "multi-layer" option enabled, you can preview history for more days and even different devices at once. To use multi-layered history:
- Check the checkbox next to "multi layers" option,
- Select device and day and click show (like you'd do normally when browsing history). You can also use plus () and minus () buttons.
- Every time, a new layer will be made, with a line in a different color. To see all layers, click button "details" and select tab "layers".
- Here, you can select and delete layers.
- There's also an option to clear map - delete all layers. Open menu next to "details" button and click option "clear layers on map".