For (3), right click the panel and Unlock Widgets if their locked, click on the cashew on the right side of the panel, choose More Settings, Auto Hide.
For (4), right click the panel and Unlock Widgets if their locked, click on the cashew on the right side of the panel, now move your cursor over the desired icon you wish to move, a cross pointer appears over the icon, now move it to the desired position on the panel.
Peace