fix(ui): prevent example select from overflowing (#7060)

src/core/components/examples-select.jsx

@@ -109,6 +109,7 @@ export default class ExamplesSelect extends React.PureComponent {
           ) : null
         }
         <select
+          className="examples-select-element"
           onChange={this._onDomSelect}
           value={
             isModifiedValueAvailable && isValueModified

src/style/_layout.scss

@@ -127,7 +127,10 @@
 
 .examples-select {
     margin-bottom: .75em;
-
+    display: inline-block;
+    .examples-select-element {
+      width: 100%;
+    }
     &__section-label {
         font-weight: bold;
         font-size: .9rem;