From Microsoft PowerBI blog: https://powerbi.microsoft.com/en-us/blog/power-bi-desktop-december-2018-feature-summary/#smartGuides
You’ll now see smart alignment guides when moving objects on your report page, like you see in PowerPoint, to help you align everything on your page. You’ll see the smart guides any time you drag or resize something on your page.
When you move an object near another one, it will snap into a position aligned with the other object.
If you decide you don’t want the smart guides, you can turn them off in the Report settings page of the Options dialog.
Watch the following video to learn more about smart guides:
Some opinions expressed in this article may be those of a guest author and not necessarily Analytikus. Staff authors are listed in https://powerbi.microsoft.com/en-us/blog/power-bi-desktop-december-2018-feature-summary/#smartGuides
