Would you like to try some of the new features coming for Power Apps? Here is a quick trick you may have missed. Rather than using the default URL https://make.powerapps.com, add a preview to it:
https://make.preview.powerapps.com
For instance, you can test the new Power Apps portals themes:

Where in the preview experience, you will see the new options:

You can find more information about this particular portal theme feature in this article from Microsoft: