In build 257 on both Android and MACOS it seems that the following workflow produces a blank white screen.
- Edit Dash Mode
- Click + to add new tile
- Select Active Device
- Select the required device
- Select Labels
- Click any copy??? button to the right of the labels text boxes
On my Samsung S21 I have to hit the OS back button to get out of the blank screen, but on MACOS, i cannot get out of the screen and need to close and open the app again.