Update unified-interface.md

Author: mduelae

powerapps-docs/user/unified-interface.md

@@ -39,13 +39,16 @@ Your administrator has to opt in to early access updates for your environment an
 
 ## Reflow 
 
-The Unified Interface is designed for a modern reflow experience. When you're on a form there are pixel breakpoints where it will move information on the screen based on your screen size. When you resize your screen, if you have a single section they will move below.
+The Unified Interface is designed for a modern reflow experience. 
+
+For forms, there are pixel breakpoints that cause information on the form to move on the screen based on the space available to the form to display in. This can happen if the space available to the form to display in decreases, for example if you resize the window the app is in and decrease the width of the window. When the width decreases past certain breakpoints, information that would be hidden will move below where it used to be so that it is either visible or can be vertically scrolled to.
+
+When columns in a form section reflows from multiple columns to one column, it reflows from left to right (in left-to-right languages). When a control spans at least two columns in a section, then it reflow from top to bottom. The difference in behavior is so that tab navigation order is kept after reflow
 
-When a form reflows from multiple columns to one column, it reflows from left to right. When a control in the column spans at least two columns in a section, then it reflow from top to bottom. 
 
 In example below, each number corresponds to a control.
 
-|Reflow experience from left to right: When multiple columns reflow to one column   |Reflow experience from top to bottom: When a control spans at least two columns in a section (notice column #5 spans across) |
+|Reflow experience from left to right: When multiple columns reflow to one column   |Reflow experience from top to bottom: When a control spans at least two columns in a section (notice control #5 spans across) |
 |---------|---------|
 | ![Reflow experience from multiple columns to one column](media/reflow_example1.png "Reflow experience from multiple columns to one column")     |     ![Reflow experience when control spans at least two columns in a section](media/reflow_example2.png "Reflow experience when control spans at least two columns in a section")   |