smaller breakpoint (#21143)

Co-authored-by: Dora Chan <[email protected]>

Author: doralchan

src/sentry/static/sentry/app/views/performance/trends/content.tsx

@@ -219,7 +219,7 @@ const TrendsLayoutContainer = styled('div')`
   display: grid;
   grid-gap: ${space(2)};
 
-  @media (min-width: ${p => p.theme.breakpoints[2]}) {
+  @media (min-width: ${p => p.theme.breakpoints[1]}) {
     grid-template-columns: repeat(2, minmax(0, 1fr));
     align-items: stretch;
   }