Hi @GayleNeufeld,
If you want to display a dashboard within your Hub homepage, you can use the iframe Card to display your dashboard as an embed. In the iframe settings height field, you will want to use vh units (eg. 100vh), which represent "viewport height," and you can actually do CSS calculations if you need to subtract the footer from that measurement.
calc(100vh - 100px)
100px being the height of your footer; re-adjust as necessary if your footer is a different height.
You can also set the settings on the Row Card that contains the iframe to a "Wide" layout to create a full-width effect and have the dashboard fill the width of a user's browser screen.