Fix stage size toggle button styling

src/components/stage-header/stage-header.css

@@ -62,8 +62,6 @@
     border-bottom-right-radius: 0;
 }
 
-.stage-button-disabled {
-    opacity: .5;
-    cursor: auto;
-    background: transparent;
+.stage-button-toggled-off {
+    filter: saturate(0);
 }

src/components/stage-header/stage-header.jsx

@@ -97,7 +97,7 @@ const StageHeaderComponent = function (props) {
                             className={classNames(
                                 styles.stageButton,
                                 styles.stageButtonLeft,
-                                (stageSizeMode === STAGE_SIZE_MODES.small) ? null : styles.stageButtonDisabled
+                                (stageSizeMode === STAGE_SIZE_MODES.small) ? null : styles.stageButtonToggledOff
                             )}
                             onClick={onSetStageSmall}
                         >
@@ -114,7 +114,7 @@ const StageHeaderComponent = function (props) {
                             className={classNames(
                                 styles.stageButton,
                                 styles.stageButtonRight,
-                                (stageSizeMode === STAGE_SIZE_MODES.large) ? null : styles.stageButtonDisabled
+                                (stageSizeMode === STAGE_SIZE_MODES.large) ? null : styles.stageButtonToggledOff
                             )}
                             onClick={onSetStageLarge}
                         >