**BUG** Concise problem statement: Changing the layer settings results in the top & bottom layer becoming 'unconfigured', i.e. they are no longer visible in the layer toolbar. Steps to reproduce bug: 1. Open the layer settings dialog. 2. Make a change - color or marking a layer configured. Save settings. 3. To fix: Open source file and change the 3rd flag in the top & bottom layers to true. Results: Top & bottom layer have disappeared from the layers toolbar. Expected results: Top & Bottom layers to not be changed. Browser: Vivaldi