According the console below the properties multipleSelectionEnabled and selectionEnabled of LayerList are deprecated on version 4.29
However, as of ArcGIS JS API 4.3, they are not:
https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-LayerList.html
@UndralBatsukh , @Sage_Wall
Deprecated means they will be going away, typically a few releases after announced. to give users time to transition.
If you go to the property links, they are marked deprecated.
https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-LayerList.html#multipleSelectionEnabled
https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-LayerList.html#selectionEnabled
Space issue, not enough room in the property list for details.
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