Adding to a long list of quality-of-life features in the Power BI software, Microsoft is introducing "Responsive visualizations" to Power BI. These new changes to Power BI make a fairly simple yet impactful change: Your projects will now dynamically react to being moved around, resized, etc. The shift will have a big impact for people who don't want to spend more time than necessary making their work look nice when they try to reformat it.
As you can see in the example, you can shrink down the new Power BI graphs quite a bit before you start to sacrifice any information. The graph will intelligently shift around things like titles and color legends in a way that makes them easy to read, saving some time for the end user.
This feature is available right now and will be backward compatible with your existing projects - although the feature will be off by default. To turn on responsive visualizations, just switch the "responsive" option in your client to "on."