I realize this has been discussed (years ago) but I'm running into this problem again on the latest version. Links to other Dashboards (dashboards that do not have the dashboard list in the left pane) do not allow jumping to other Dashboards, "Dashboard Link Tile only work with Legacy Dashboards links". I remember legacy links used to be in the app but I can no longer find them.
Assuming you are running a reasonably current release:
On the Apps page, expand the listing for Hubitat Dashboard (click the two diagonal arrows to the right of Hubitat Dashboard) so you see the listing of your dashboards, where you would configure the devices on the dashboard.
Click the desired dashboard. Scroll down. Just above the Advanced option, you will see Legacy Dashboard Links.