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It is possible to add frames from the Time Series Dialog to a dashboard, the graphs can be either based on Display Groups (since 2020.02) or the Data Viewer selection (since 2021.02).
In order to do this the "Add to dashboard button" on the top left of the Time Series Dialog can be clicked.
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Arranging the Frames
Dashboard frames can be resized as by dragging the border as you usually woulddragged and resized using the header and borders in fixed steps ('shift + space' toggles fixed step and free dragging and resizing). The drop-down menu of the the 
dashboard button also offers three options to aid in arranging the dashboard frames:
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