Mate 1.24 has 2 panels, 1 on top (with start launcher menu and clock), and another with bottom (with opened windows list).
The start launcher menu is actually an applet named
Brisk Menu which you can add to the panel. Right click on the bottom panel, click
Add to Panel, select
Brisk Menu and click
Add. You can reposition in by middle-click on the icon/applet and drag it around.
You can remove the top panel by right click and select
Delete this panel.