Can't move cells in GridMode

[monchin]

I used conda to install the dashboard, and wanted to set layout in Grid Mode. But it is strange that all cells huddled together in a small cell, and I can't move any cell at all.

This is under jupyter notebook mode
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This is under dashboard grid mode
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What's more, when I use grid mode, and then click dashboard preview button, there appears an empty page. But when I use report mode, everything goes well. But I need to move and resize cells to make layout beautiful.
Why does this happend? Did I ignore any settings when starting to use dashboard?

My environment:
OS: Ubuntu 16.04 LTS (server)
python: 3.7.3
jupyter 1.0.0
jupyter-dashboards 0.7.0
jupyter_client 5.3.1
jupyter_console 6.0.0
jupyter_core 4.5.0
jupyterlab 1.0.2
jupyterlab_server 1.0.0

[casertap]

same here

[jacksnape-tfn]

Same here