In this video, I'll cover a calculation that allows you to determine the width of a Power BI visual if you want equal space distance between visuals that span the whole page. It's good design practice to use equal-sized spacing between your visuals.
It's also good practice to use the same width of visuals if you have a row of visuals spanning the whole page width. However, it needs a bit of maths to work out the width of the visuals and this video takes you through this process step-by-step.