How do I add a Home Assistant dashboard to the Microsoft Edge side-bar?

Microsoft Edge has a side-bar feature which I had no use for until now. I want to have my Home Assistant dashboard so that it is easily accessible while browsing. When I go to add the dashboard, the Add current page button is disabled. Why is this?

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Edge disables the “Add current page” button automatically if the webpage is already at your sidebar.
This is not HA specific.

So if you have already added your “main url” (e.g. www.my-homeassistant.com), you will not be able to add any subpage ,like e.g. www.my-homeassistant.com/lovelace/mydashboard

But you can add multile URLs at the “same level” e.g. if you add www.my-homeassistant.com/lovelace/mydashboard , you can still add www.my-homeassistant.com/lovelace/second_dashboard