Additional space for dashboard tiles can be obtained by hiding the navigation pane. To toggle between hiding or showing the navigation pane, click the three lines above the Favorite icon (star symbol), per the following image:

URL parameters can also be used to open dashboards with the navigation pane hidden by default. In the following example, a string of text from the question mark through the true property has been appended to the end of the URL for a dashboard:

https://app.powerbi.com/groups/abc123/dashboards/d8465?collapseNavigation=true

The modified URL could be shared with users such that users of the dashboard aren't required to click on the navigation pane icon.