Dashboard layouts are supported and perserved when saving JMP reports as interactive HTML in JMP 13. On Windows, select File > Save As and select Interactive HTML with Data from the Save as type list. On Macintosh, select File > Export > Interactive HTML with Data.
You can see a set of example dashboards published as interactive HTML with data on the dashboards page on jmp.com.
If you want to create an index page of dashboards you can also investigate the View > Create Web Report functionality.
Thank you for the suggestions on improving the snap to grid capabilities of dashboards in the future. It's something that we will consider improving for sure. In the mean time, there is a mode of a running dashboard called summary view (Dashboard LIRT > Report View > Summary), which helps to simplify the layout of the embedded reports in a dashboard and also makes all panes of the dashboard stretchable, even when the platform is not stretchable in the standalone platform (e.g. Distribution).
Attached is an example screenshot of a dashboard using the Filter + 1 template from the Dashboard Builder. This dashboard is in summary mode and the three graphs line up in columns. The distribution of 'lot' acts as a selection filter, where selection in the one graph cause a local data filter effect on the Graph Builder graph as well as the two statistical platform outputs from Process Capability and Distribution "downstream".
You can arrange the dashboards any way you like -- with graph spanning rows or columns, or with graphs in tabs. For example -- a more complex layout below:
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